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  • 11
    Online Resource
    Online Resource
    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
    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
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 12
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2018
    In:  Environmental Earth Sciences Vol. 77, No. 18 ( 2018-9)
    In: Environmental Earth Sciences, Springer Science and Business Media LLC, Vol. 77, No. 18 ( 2018-9)
    Type of Medium: Online Resource
    ISSN: 1866-6280 , 1866-6299
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 2493699-6
    SSG: 13
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  • 13
    In: Limnologica, Elsevier BV, Vol. 76 ( 2019-05), p. 82-93
    Type of Medium: Online Resource
    ISSN: 0075-9511
    RVK:
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2019
    detail.hit.zdb_id: 3380-7
    detail.hit.zdb_id: 2187207-7
    SSG: 12
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  • 14
    In: Biogeosciences, Copernicus GmbH, Vol. 15, No. 15 ( 2018-08-15), p. 4799-4814
    Abstract: Abstract. The Red River (Vietnam) is representative of a south-east Asian river system, strongly affected by climate and human activities. This study aims to quantify the spatial and seasonal variability of CO2 partial pressure and CO2 emissions of the lower Red River system. Water quality monitoring and riverine pCO2 measurements were carried out for 24 h at five stations distributed along the lower Red River system during the dry and the wet seasons. The riverine pCO2 was supersaturated relative to the atmospheric equilibrium (400 ppm), averaging about 1589±43 ppm and resulting in a water–air CO2 flux of 530.3±16.9 mmol m−2 d−1 for the lower Red River. pCO2 and CO2 outgassing rates were characterized by significant spatial variation along this system, with the highest values measured at Hoa Binh station, located downstream of the Hoa Binh Dam, on the Da River. Seasonal pCO2 and CO2 outgassing rate variations were also observed, with higher values measured during the wet season at almost all sites. The higher river discharges, enhanced external inputs of organic matter from watersheds and direct inputs of CO2 from soils or wetland were responsible for higher pCO2 and CO2 outgassing rates. The difference in pCO2 between the daytime and the night-time was not significant, suggesting weak photosynthesis processes in the water column of the Red River due to its high sediment load.
    Type of Medium: Online Resource
    ISSN: 1726-4189
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2018
    detail.hit.zdb_id: 2158181-2
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  • 15
    In: Plant Ecology and Evolution, Agentschap Plantentuin Meise, Vol. 152, No. 2 ( 2019-07-09), p. 163-177
    Abstract: Background and aims – Biomonitoring is an important tool for assessing river water quality, but is not routinely applied in tropical rivers. Marked hydrological changes can occur between wet and dry season conditions in the tropics. Thus, a prerequisite for ecological assessment is that the influence of ‘natural’ hydrological change on biota can be distinguished from variability driven by water quality parameters of interest. Here we aimed to (a) assess seasonal changes in water quality, diatoms and algal assemblages from river phytoplankton and artificial substrates through the dry-wet season transition (February–July 2018) in the Red River close to Hanoi and (b) evaluate the potential for microscopic counts and high-performance liquid chromatography (HPLC) analysis of chlorophyll and carotenoid pigments for biomonitoring in large tropical rivers. Methods – River water (phytoplankton) and biofilms grown on artificial glass substrates were sampled monthly through the dry (February–April) to wet (May–August) season transition and analysed via microscopic and HPLC techniques. Key results – All phototrophic communities shifted markedly between the dry and wet seasons. Phytoplankton concentrations were low (c. thousands of cells/mL) and declined as the wet season progressed. The dominant phytoplankton taxa were centric diatoms (Aulacoseira granulata and Aulacoseira distans) and chlorophytes (Scenedesmus and Pediastrum spp.), with chlorophytes becoming more dominant in the wet season. Biofilm diatoms were dominated by Melosira varians, and areal densities declined in the wet season when fast-growing pioneer diatom taxa (e.g. Achnanthidium minutissimum, Planothidium lanceolatum) and non-degraded Chlorophyll a concentrations increased, suggesting active phytobenthos growth in response to scour damage. Otherwise, a-phorbins were very abundant in river seston and biofilms indicating in situ Chlorophyll a degradation which may be typical of tropical river environments. The very large range of total suspended solids (reaching 〉 120 mg/L) and turbidity appears to be a key driver of photoautotrophs through control of light availability. Conclusions – Hydrological change and associated turbidity conditions exceed nutrient influences on photoautotrophs at inter-seasonal scales in this part of the Red River. Inter-seasonal differences might be a useful measure for biomonitoring to help track how changes in suspended solids, a major water quality issue in tropical rivers, interact with other variables of interest.
    Type of Medium: Online Resource
    ISSN: 2032-3921 , 2032-3913
    URL: Issue
    Language: Unknown
    Publisher: Agentschap Plantentuin Meise
    Publication Date: 2019
    detail.hit.zdb_id: 2551053-8
    SSG: 12
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  • 16
    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
    Language: Unknown
    Publisher: Vietnamese Journal of Food Control, National Institute for Food Control
    Publication Date: 2022
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  • 17
    Online Resource
    Online Resource
    Informa UK Limited ; 2021
    In:  Carbon Management Vol. 12, No. 5 ( 2021-09-03), p. 549-557
    In: Carbon Management, Informa UK Limited, Vol. 12, No. 5 ( 2021-09-03), p. 549-557
    Type of Medium: Online Resource
    ISSN: 1758-3004 , 1758-3012
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2021
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  • 18
    Online Resource
    Online Resource
    Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden ; 2018
    In:  Journal of Vietnamese Environment Vol. 9, No. 4 ( 2018-08-08), p. 217-222
    In: Journal of Vietnamese Environment, Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden, Vol. 9, No. 4 ( 2018-08-08), p. 217-222
    Abstract: Ba Vi National Park, one of 28 Vietnamese National Parks, is currently preserved and exploited for a variety of purposes, including the preservation of intact natural forest ecosystems and genetic resources of rare plants and animals. This paper presents the monitoring results of microbial contamination in surface water environment of the Ba Vi National Park (Ha Noi) in the period 2013-2014 and 2018. The results showed that total coliform (TC) density varied from 23 to 11,000 MPN/100ml in bimonthly observation in 2013-2014 which was lower than that one of sampling campaign in 2018, from 900 MPN/100ml to 8,100 MPN/ml. Fecal coliform (FC) densities varied from 0 to 110 MPN/100ml in 2013-2014, lower than in 2018, when it varied from 0 MPN/100ml to 600 MPN/100ml. At several observation times, both TC and FC were higher than the allowable values of the Vietnam national technical regulation QCVN 08-MT: 2015/BTNMT column A1 for surface water quality. The exceeded values of TC and FC than the allowable values and the increase trend from the 2013 to 2018 periods indicated the potential risks to the public health in this region when people use water for domestic and agricultural purposes. Our results provide dataset for environmental management in the Ba Vi National Park in order to protect the eco-environment in parallel with social-economic development. Vườn Quốc gia Ba Vì, một trong 28 vườn quốc gia của Việt Nam hiện đang được bảo tồn và khai thác cho nhiều mục đích, trong đó có bảo tồn nguyên vẹn các hệ sinh thái rừng tự nhiên, các nguồn gen động, thực vật quý hiếm, các đặc sản rừng và các di tích lịch sử, cảnh quan tự nhiên trong vùng. Bài báo trình bày kết quả quan trắc, đánh giá mức độ ô nhiễm vi sinh vật trong môi trường nước mặt tại Vườn Quốc Gia Ba Vì, Hà Nội giai đoạn 2013-2014 và 2018. Kết quả cho thấy mật độ coliform tổng số (TC) biến đổi trong khoảng từ 23 – 11.000 MPN/100ml trong các đợt quan trắc định kỳ 2 tháng/lần trong hai năm 2013 - 2014 và trong khoảng từ 900 – 8.100 MPN/100ml trong một đợt quan trắc năm 2018. Mật độ fecal coliform (FC) biến đổi trong khoảng từ 0 - 110 MPN/100ml năm 2013 -2014 và từ 0 - 600 MPN/100ml vào năm 2018. Vào một số thời điểm quan trắc, mật độ FC và TC vượt giá trị cho phép của quy chuẩn kỹ thuật Quốc Gia QCVN 08-MT:2015/BTNMT cột A1 về chất lượng nước mặt. Các giá trị TC và FC vượt quá giá trị cho phép và xu hướng gia tăng TC và FC từ 2013 -2018 cho thấy nguy cơ tiềm tàng khi người dân sử dụng nguồn nước này cho các mục đích sinh hoạt và nông nghiệp. Như vậy, kết quả của nghiên cứu này nhấn mạnh nhu cầu giám sát thường xuyên chất lượng nước và cần thực hiện các giải pháp hiệu quả để xử lý và quản lý nguồn gây ô nhiễm trong khu vực nhằm bảo vệ môi trường sinh thái song song với phát triển kinh tế - xã hội của khu vực.
    Type of Medium: Online Resource
    ISSN: 2193-6471
    URL: Issue
    Language: Unknown
    Publisher: Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden
    Publication Date: 2018
    detail.hit.zdb_id: 2674408-9
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  • 19
    In: Journal of Vietnamese Environment, Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden, Vol. 9, No. 4 ( 2018-08-08), p. 191-197
    Abstract: Wastewater, especially non-treated wastewater from different sources is one of causes for surface and ground water pollution. However, the monitoring of wastewater quality has not been regularly implemented. This paper presents the preliminary observation results of the wastewater quality of different sources such as domestic, fishery processing, husbandry, agricultural runoff and irrigation canals in some coastal communes of Giao Thuy district, Nam Dinh province in 2017 - 2018. The results showed variation values of some variables as following: pH: 3.4 to 8.7; DO: 1.1 – 7.6 mg/l; conductivity: 0.01 – 〉 99.9 S/m; Suspended solids: 7 – 599 mg.L-1; nitrate (NO3-): 0.01-1.74 mgL-1; ammonium (NH4+): 0.01 - 3.99 mgNL-1, phosphate (PO43-): 〈 0.01– 3.05 mgPL-1, total phosphorus: 0.01 – 5.03 mgPL-1. The values of some variables such as DO, pH, nitrite, ammonium, suspended solids and phosphate at some observation time exceeded the allowed values of the Vietnamese standards for domestic wastewater quality, for industrial wastewater quality and for surface water quality. Among these different wastewaters observed, the higher contents of nutrients were found for domestic wastewater. The results provide a dataset for environmental managers in order to control of wastewater quality, especially for the coastal communes where coastal aquacultural areas are large like Giao Thuy district, Nam Dinh province. Nước thải, đặc biệt là nước thải chưa qua xử lý từ nhiều nguồn thải khác nhau là một trong những nguyên nhân gây ô nhiễm nguồn nước mặt và nước ngầm. Tuy nhiên việc giám sát chất lượng nước, lại chưa được thường xuyên thực hiện. Bài báo trình bày kết quả khảo sát bước đầu về chất lượng nước thải sinh hoạt, chế biến thủy sản, chăn nuôi, nông nghiệp, kênh dẫn tưới tiêu tại một số xã ven biển thuộc huyện Giao Thủy, tỉnh Nam Định trong năm 2017 - 2018. Kết quả khảo sát cho thấy khoảng giá trị của một số thông số như sau: pH 3,4 – 8,7; DO: 1,1 – 7,6 mgL-1; độ dẫn điện: 0,01 – 99,9 S/m; chất rắn lơ lửng: 7 – 599 mg.L-1; nitrat (NO3-): 0.01-1.74 mgL-1; amoni (NH4+): 0.01 - 3.99 mgNL-1; phốtphat (PO43-): 〈 0,01 - 3,05 mgPL-1 và phốtpho tổng số: 0,01 – 5,03 mgL-1. Hàm lượng một số chỉ tiêu như NO2, NH4+, PO43-, SS tại một số thời điểm đã vượt quá giá trị cho phép theo các quy chuẩn nước thải sinh hoạt, nước thải công nghiệp và nước tưới tiêu. Trong các loại nước thải đã quan trắc, nước thải sinh hoạt có hàm lượng các chỉ tiêu dinh dưỡng cao hơn. Các kết quả nghiên cứu nhằm cung cấp cơ sở dữ liệu cho các nhà quản lý về việc kiểm soát chất lượng nước thải, đặc biệt là các xã ven biển có diện tích nuôi trồng thủy sản khá lớn như huyện Giao Thủy, tỉnh Nam Định.
    Type of Medium: Online Resource
    ISSN: 2193-6471
    URL: Issue
    Language: Unknown
    Publisher: Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden
    Publication Date: 2018
    detail.hit.zdb_id: 2674408-9
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  • 20
    In: Tạp chí Khoa học và Công nghệ Nhiệt đới, Trung tâm Nhiệt đới Việt - Nga, ( 2021)
    Type of Medium: Online Resource
    ISSN: 0866-7535
    Language: Unknown
    Publisher: Trung tâm Nhiệt đới Việt - Nga
    Publication Date: 2021
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