Open AccessSỬ DỤNG CÁC CHỈ SỐ ĐỂ ĐÁNH GIÁ CHẤT LƯỢNG NƯỚC VÀ PHÂN LOẠI MỨC ĐỘ PHÚ DƯỠNG CỦA VÙNG NƯỚC VEN BIỂN QUẢNG NINH - HẢI PHÒNG
Author(s) -
Lê Văn Nam,
Dương Thanh Nghị,
Le Thi Kim Ngan
Publication year - 2018
Publication title -
vietnam journal of marine science and technology/vietnam journal of marine science and technology (vietnam academy of science and technology)
Language(s) - English
Resource type - Journals
ISSN - 1859-3097
DOI - 10.15625/1859-3097/17/4/8141
Subject(s) - eutrophication , water quality , environmental science , nitrate , pollutant , hydrology (agriculture) , water body , environmental chemistry , environmental engineering , chemistry , nutrient , ecology , geology , biology , geotechnical engineering , organic chemistry
With the fast economic growth and the loose management of pollutants discharged into the sea, the Quang Ninh - Hai Phong coastal water faces the risk of contamination of toxic subtances; and the eutrophication can occur. Therefore, coastal water quality was monitored at Tra Co, Cua Luc and Do Son in 2015. The results showed that sea water had the higher concentration of nitrate and 4.4’DDD compared to limit values. RQ coefficient of coastal areas was medium (0.25 < 0.562 < 0.75), hence “environmental safety”. According to the SWQI index, the water quality in three stations was good and not polluted. In terms of eutrophication level classification according to OECD (1982), the water body of all stations was mesotrophic. According to classification by TRIX index, only water body of Do Son station was in a state of eutrophication, that of the remaining stations was mesotrophic.