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  • 1
    Online Resource
    Online Resource
    Microplastics in the Surface Sediment of the main Red River Estuary
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Earth Sciences ( 2022-09-05)
    Details
    In: Vietnam Journal of Earth Sciences, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2022-09-05)
    Abstract: Microplastics ( 〈 5mm) are one emerging pollutant in the environment. These are the threats and challenges facing the global environment, economy, and society, especially in hotspot regions such as Asia. This paper presents the microplastic characteristics found in the surface sediment of the main Red River estuary (the Ba Lat) during four separate monitoring runs in 2020. The microplastic amount in the sediment samples varied from 800 items per kg of dried weight (dw) to 3,817 items.kg-1 dw, averaging 2,188 ± 1,499 items.kg-1 dw. Fiber and fragment microplastics were discovered to be primary shapes, of which fibers dominated (94%). Microplastic fiber sizes were found mainly in the 〈 500 µm (69%) range. The most primarily observed colors of microplastics were blue (36%), white (21%), and red (11%). There were five recognized polymer types (polypropylene (PP), polyethylene (PE), polyurethane (PU), polyamide (PA), and polystyrene (PS)) in the sediment samples, with PE and PP predominating. Seasonal fluctuations in microplastic concentrations at the Ba Lat site, a significant aquaculture zone, may indicate the contribution of multiple sources. Our research demonstrated the necessity of microplastic observation in organisms, particularly in the aquaculture zones in Vietnam. Our findings further underline the importance of managing and minimizing the amount of plastic garbage that enters the ecosystem.
    Type of Medium: Online Resource
    ISSN: 2615-9783 , 2615-9783
    URL: Article
    DOI: 10.15625/2615-9783/17486
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Preliminary results on microplastics in surface water from the downstream of the Day River
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Earth Sciences ( 2021-08-31)
    Details
    In: Vietnam Journal of Earth Sciences, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2021-08-31)
    Abstract: Microplastics (MPs), referring to plastic items ranging from 1 to 5000 µm long, are polluting the terrestrial and aquatic environments and are becoming a threat to the health of ecosystems, biota, and humans. Rivers are major carriers of these materials from the terrestrial environment to the oceans. In the present study, the occurrence of MPs in a peri-urban river was investigated. The Day river system is a good example of a peri-urban river strongly influenced by human activities in the whole basin. Water samples were collected from the downstream of the Day river, including Cau Que, Cau Do, and Do Thong, in the rainy and dry seasons using a plankton sampling net for identifying microplastic concentration, size, shape, color, and polymer composition. Microplastic abundance in the surface water ranged from 269,693±60,624 to 863,005±131,925 items/m3. The microplastic concentration in the rainy season was higher than that in the dry season. MPs abundance was increased at a site near urban areas with high human activity. The microplastic shape was collected in different seasons did not change significantly, with microplastic fibers as the major items, accounting for above 92% of the total items. Many fibers microplastics collected in this study were in small sizes of 300-1000 µm and 1000-2000 µm, occupying 78.5-85.7% of the total microplastic items. Purple was the most common color of microplastics. Polyethylene (PE) and polypropylene (PP) were major polymer types of the selected items in the surface water samples downstream of the Day River.
    Type of Medium: Online Resource
    ISSN: 2615-9783 , 2615-9783
    URL: Article
    DOI: 10.15625/2615-9783/16504
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 3
    Online Resource
    Online Resource
    Removal of methylene blue from aqueous solution by biochar derived from rice husk
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Earth Sciences ( 2022-03-15)
    Details
    In: Vietnam Journal of Earth Sciences, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2022-03-15)
    Abstract: In this research, rice husk-derived biochar (BC) was evaluated to determine the suitable conditions for the methylene blue (MB) solution adsorption. The characterization of BC was identified by the methods of FT-IR, Raman, and point of zero charges (PZC). The adsorption studies were carried out with BC at different activation conditions (raw BC, HNO3 25% for 4 hours, NaOH 25% for 4 hours, H2O at 90°C for 2 hours and 4 hours, HNO3 25% at 90°C for 2 hours and 4 hours). The activated material then went through an adsorption assessment. Activated BC with NaOH 25% showed its preeminence compared to the other six conditions when reaching the maximum efficiency after the first hour of adsorption. The investigation revealed that the adsorption capacity of the material depends on the activation methods, including pH, activation agent, temperature, and time. The adsorption of BC was consistent with the pseudo-first-order kinetic model and the Langmuir isotherm model, with high correlation coefficients (R2: 0.9838 and 0.9975, respectively). Therefore, it can be concluded that the use of rice husk is feasible for the removal of MB from aqueous solutions.
    Type of Medium: Online Resource
    ISSN: 2615-9783 , 2615-9783
    URL: Article
    DOI: 10.15625/2615-9783/16998
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Initial survey on microplastic waste in coastal water in Nam Dinh
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 2 ( 2022-06-21), p. 209-216
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 2 ( 2022-06-21), p. 209-216
    Abstract: Plastic materials are defined as including the whole of organic polymers owning plasticity. Their production increases rapidly due to their superior properties and applications in our life. Currently, the annual production of plastic is estimated at nearly 400 million tons. About 10% of the plastic produced is discharged into the seas and oceans. Microplastics (MP, less than 5 mm in size) are non-biodegradable and persistent in the environment and have the ability to accumulate in various environmental components, organisms and other human beings through the food chain. Therefore, assessing microplastic pollution becomes essential for the marine and ocean environment. This study aims to evaluate microplastic pollution in Nam Dinh seawater. Water samples were taken in summer 2020 and spring 2021 in Giao Thuy district, Nam Dinh province. Samples were treated with 30% H2O2 solution to remove organic matters and then microplastic buoyantly separated using saturated NaCl solution. MP was identified through observation under a stereo microscope (Olympus SZX2-TR300) and its nature was determined through infrared spectroscopy (µFTIR). Results show that a large level of pollution (average 6 to 8 particles/m3 and 10–14 million particles/km2) is associated with the predominant of colored fibers among MP characteristics. Most of the microplastics identified are Polypropylene in nature. Next, more research needs to be invested in this pollution problem, such as expanding the scope and research object.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/16544
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    First evaluation of iron and manganese concentrations in coastal aquaculture water in Giao Thuy district, Nam Dinh province
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Tạp chí Khoa học và Công nghệ Biển Vol. 21, No. 3 ( 2021-09-30), p. 319-327
    Details
    In: Tạp chí Khoa học và Công nghệ Biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 21, No. 3 ( 2021-09-30), p. 319-327
    Abstract: Aquaculture in the coastal zone has contributed significantly to economic development in Giao Thuy district, Nam Dinh province. Therefore, water quality for aquaculture plays a vital role in sustainable aquaculture production. In this paper, iron (Fe) and manganese (Mn) concentrations in aquaculture coastal water of Giao Thuy district were analyzed during the rainy season (September 2017, August 2018) and dry season at low tide. The results showed that Fe concentration varied from 0.09 mg/L (at VT5) to 2.42 mg/L (at VT4), averaging 1.12 ± 0.71 mg/L, which exceeded the critical value of the national technical regulation on marine water quality in Vietnam for coastal aquaculture water (QCVN 10:2015/BTNMT) from 1.5 times (at VT4) to 3.0 times (at VT1). Mn concentrations ranged from 0.02 mg/L (at VT9) to 0.10 mg/L (at VT1), averaging 0.05 ± 0.02 mg/L, which was lower than the critical value in the QCVN 10:2015/BTNMT. The results showed that no apparent seasonal variation was observed for both Fe and Mn concentrations. In the dry season, the Fe and Mn concentrations averaged 1.10 mg/L and 0.05 mg/L respectively, whereas they were 1.15 mg/L and 0.05 mg/L in the rainy season. The monitoring results showed that Fe was polluted in the study area and may affect aquaculture productivity. Therefore, helpful measures should be taken to minimize Fe pollution to protect water quality and develop sustainable aquaculture in Giao Thuy district, Nam Dinh province.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/16655
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Inhibition effect of engineered silver nanoparticles to bloom forming cyanobacteria
    IOP Publishing ; 2016
    In:  Advances in Natural Sciences: Nanoscience and Nanotechnology Vol. 7, No. 3 ( 2016-08-24), p. 035018-
    Details
    In: Advances in Natural Sciences: Nanoscience and Nanotechnology, IOP Publishing, Vol. 7, No. 3 ( 2016-08-24), p. 035018-
    Type of Medium: Online Resource
    ISSN: 2043-6262
    URL: Article
    DOI: 10.1088/2043-6262/7/3/035018
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 2563789-7
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  • 7
    Online Resource
    Online Resource
    Groundwater quality evaluation using Water Quality Index and GIS technique for the Holocene and Pleistocene aquifers in the coastal zone of Ninh Thuan province
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Tạp chí Khoa học và Công nghệ Biển Vol. 21, No. 2 ( 2021-06-30), p. 133-148
    Details
    In: Tạp chí Khoa học và Công nghệ Biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 21, No. 2 ( 2021-06-30), p. 133-148
    Abstract: This study represents the application of the Water Quality Indices (WQI) and GIS techniques to grading water pollution and the factors that influenced the groundwater quality of the Holocene (qh) and Pleistocene (qp) aquifers in the coastal zone of Ninh Thuan province. 100 underground water samples were collected from residential water well of qh aquifer (53 samples) and qp aquifer (47 samples). Water quality indices using in the study incorporated total dissolved solids (TDS), chloride (Cl-), flouride (F-), nitrite (NO2-), nitrate (NO3-), iron (Fe3+), manganese (Mn2+). Calculated WQI grading scale for the groundwater quality of the 100 water samples ranged from very good to inedible for drinking purpose. The result shown the water sample graded as “excellent water quality” accounted the most (23,3% and 14,9% for the qh and qp aquifer, respectively), the followings were “good water quality” grade ranked the second (9,4% and 8,5%); “poor water quality” grade (43,4% and 30,04%); “very poor water quality” grade (1,89% and 10,64%); and “inedible” grade (16,98% and 31,9%). Water samples graded as “very poor” and “inedible” were mostly distributed on the southeast of Ninh Hai district and Tri Hai commune (Ninh Hai district), Xuan Hai and Cong Hai communes (Thuan Bac district), Phuoc Thuan (Ninh Phuoc district) of the qh aquifer, and to the south of study area of the qp aquifer because of the exceptionally high TDS. Other samples which were low on TDS but graded “bad” due to surprisingly high concentrations of other ions (Cl-, NO3-, NO2-). The result provided concreted information on the polluted agents in groundwater and a valuable tool to support authorities in management and zoning groundwater quality of the study area.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/16402
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 8
    Online Resource
    Online Resource
    Nanoparticles as a control for cyanobacterial bloom : Vật liệu nano đóng vai trò kiểm soát sự bùng nổ của vi khuẩn lam
    Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden ; 2017
    In:  Journal of Vietnamese Environment Vol. 8, No. 3 ( 2017-01-17), p. 161-166
    Details
    In: Journal of Vietnamese Environment, Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden, Vol. 8, No. 3 ( 2017-01-17), p. 161-166
    Abstract: This study aims to investigate the toxicity of copper material synthesized by chemical reduction method and effects of environmental variables on growth of phytoplankton community (dominated by Microcystis genus) in the Tien eutrophic lake, Hanoi, Vietnam. The variables analyzed include: physical (pH and Turbidity), chemical (content of NH4+, PO43- and copper metal), biological (con- tent of Chlorophyll-a, cell density). The characteristic of nanomaterial was confirmed by using UV- visible spectrophotometer, XRD, SEM and TEM methods. The CuNPs showed they spherical form and uniform size about 20-40 nm. The experimental results showed that the treated with CuNPs inhibition on growth against phytoplankton after 8 days. The cell density of phytoplankton commu- nity and Microcystis genus in samples exposure with CuNPs declined after 8 days from 647.037 and 467.037 down to 381.111 and 202.592, respectively. Mục đích của nghiên cứu này là khảo sát độc tính của vật liệu nano đồng được tổng hợp bằng phương pháp khử hóa học và ảnh hưởng của các yếu tố môi trường đến sinh trưởng và phát triển của quần xã thực vật nổi (chủ yếu là chi Microcystis) trong nước hồ Tiền phú dưỡng, tại Hà Nội, Việt Nam. Các thông số phân tích bao gồm: thủy lý (pH và độ đục), hóa học (hàm lượng amoni, photphat và hàm lượng đồng kim loại), sinh học (hàm lượng chất diệp lục, mật độ tế bào). Đặc trưng của vật liệu được xác định bằng các phương pháp quang phổ UV-VIS, XRD, SEM và TEM. Vật liệu nano đồng có dạng hình cầu, kích thước đồng nhất từ 20 đến 40 nm. Kết quả thử nghiệm sau 8 ngày cho thấy các mẫu có bổ sung vật liệu nano đồng ức chế sinh trưởng quần xã thực vật nổi ở nồng độ 1mg/l. Mật độ quần xã thực vật nổi và chi Microcystis trong mẫu xử lý với CuNPs đã giảm tương ứng sau 8 ngày từ 647.037 và 467.037 xuống còn 381.111 và 202.592.
    Type of Medium: Online Resource
    ISSN: 2193-6471
    URL: Issue
    URL: Article
    DOI: 10.13141/jve.vol8.no3
    DOI: 10.13141/jve.vol8.no3.pp161-166
    Language: Unknown
    Publisher: Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden
    Publication Date: 2017
    detail.hit.zdb_id: 2674408-9
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  • 9
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    Online Resource
    Preliminary investigations of organic pollution in water environment of some urban lakes in Hanoi city, Vietnam : Bước đầu đánh giá ô nhiễm hữu cơ trong môi trường nước của một số hồ Hà Nội, Việt Nam
    Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden ; 2016
    In:  Journal of Vietnamese Environment Vol. 8, No. 2 ( 2016-11-01), p. 107-113
    Details
    In: Journal of Vietnamese Environment, Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden, Vol. 8, No. 2 ( 2016-11-01), p. 107-113
    Abstract: Lakes in Hanoi play an important role in local human life. However, along with the economic and social development, some urban lakes have been polluted, especially organic pollution. This paper presents the monthly survey results for organic pollution assessment of ten selected lakes in Ha Noi city: the Ho Tay, Truc Bach, Thien Quang, Ba Mau, Bay Mau, Hoan Kiem, Ngoc Khanh, Giang Vo, Thanh Cong and Thu Le lakes during the period from March 2014 to February 2015. The survey results showed that the Ba Mau lake was organic polluted at level IV whereas other lakes were contaminated by organic matters at level III. Organic pollution may come from both autochthonous and allochthonous sources. Compared with the results of previous studies, the water quality of 10 lakes in the period from March 2014 to February 2015 has been improved thank for the recent application of some positive solutions for lake environmental protection. Hệ thống hồ ở Hà Nội đóng vai trò quan trọng trong đời sống của người dân. Tuy nhiên, cùng với sự phát triển kinh tế xã hội, nhiều hồ trong nội đô đã và đang bị ô nhiễm, đặc biệt là ô nhiễm hữu cơ. Bài báo này trình bày kết quả khảo sát ô nhiễm hữu cơ tại 10 hồ trong thành phố Hà Nội: hồ Tây, Trúc Bạch, Thiền Quang, Ba Mẫu, Bảy Mẫu, Hoàn Kiếm, Ngọc Khánh, Giảng Võ, Thành Công và Thủ Lệ trong thời gian từ tháng 3 năm 2014 đến tháng 2 năm 2015. Kết quả khảo sát cho thấy hồ Ba Mẫu bị ô nhiễm hữu cơ ở mức IV, các hồ còn lại bị ô nhiễm hữu cơ ở mức III. Ô nhiễm hữu cơ tại các hồ có thể do cả hai nguồn cung cấp chất hữu cơ, ngoại lai và nội sinh. So với kết quả quan trắc trước đây, chất lượng nước 10 hồ Hà Nội đã được cải thiện do gần đây đã áp dụng một số biện pháp bảo vệ môi trường cho các hồ.
    Type of Medium: Online Resource
    ISSN: 2193-6471
    URL: Issue
    URL: Article
    DOI: 10.13141/jve.vol8.no2
    DOI: 10.13141/jve.vol8.no2.pp107-113
    Language: Unknown
    Publisher: Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden
    Publication Date: 2016
    detail.hit.zdb_id: 2674408-9
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  • 10
    Online Resource
    Online Resource
    Preliminary observation of microplastic contamination in some spice-salt samples purchased in Hanoi city
    Vietnamese Journal of Food Control, National Institute for Food Control ; 2022
    In:  Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Vol. 5, No. 3 ( 2022-08-31), p. 207-216
    Details
    In: Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam, Vietnamese Journal of Food Control, National Institute for Food Control, Vol. 5, No. 3 ( 2022-08-31), p. 207-216
    Abstract: Currently, plastic and microplastic pollution have become a common problem in many countries around the world, especially in developing countries, including Vietnam. Salt is the main ingredient in most of the spices used, but microplastic contamination has also been reported in seasalt samples in Vietnam. This paper presents the observation results of microplastic concentrations in some spice-salt samples that were purchased in the market in Hanoi, Viet Nam. The analysis results showed that the microplastic concentrations in the spice-salt samples varied in a wide range, from 320 to 1880 items/kg spice-salt. Microplastic fibers accounted for the majority (99%), whereas fragment forms accounted for a negligible proportion (1%). Microplastics were observed with a wide variety of colors, of which blue, red, and black were predominant. The results contribute to assessing the level of microplastic contamination in spice-salts in Hanoi city, Vietnam in order to give warnings and propose solutions to prevent and minimize microplastic contamination in spice-salt, for protecting the health of human consumers.
    Type of Medium: Online Resource
    ISSN: 2615-9252
    URL: Article
    DOI: 10.47866/2615-9252/vjfc.3930
    Language: Unknown
    Publisher: Vietnamese Journal of Food Control, National Institute for Food Control
    Publication Date: 2022
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