Open AccessFLUCTUATION OF WATER QUALITY IN SOME COASTAL AREAS IN VIETNAM
Author(s) -
Dương Thanh Nghị
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 - 10.15625/1859-3097/18/2/10898
Subject(s) - water column , water quality , bay , dry season , zoology , environmental science , hydrology (agriculture) , wet season , river mouth , suspended solids , environmental chemistry , chemistry , environmental engineering , oceanography , ecology , wastewater , biology , geology , sediment , paleontology , geotechnical engineering
Water quality was assessed in the dry season (in April 2014) and the rainy season (in August 2013) in some coastal areas: Bach Dang river mouth, Da Nang bay and Thi Nai pond. The results showed that the seasonal fluctuation was different from each area. According to the national technical regulation for coastal water quality (QCVN 10MT: 2015/BTNMT), some environment parameters were over the limited values. The average of water column temperature in the dry season was in the range from 30.18 - 30.45oC (>30oC) at Thi Nai pond; the average of the total suspended solid (TSS) concentration in water column was from 59.8 mg/l to 81.6 mg/l
(>50 mg/l) at Bach Dang river mouth; the average of chemical oxygen demand (COD) concentration in water column was in the range from 5.78 - 8.20 mg/l (> 3 mg/l) at Thi Nai pond; the average of ammonium (NH4+) concentration in water column was from 119.1 mg/l to 144.7 mg/l (>100 mg/l) at Bach Dang river mouth; the average of copper (Cu) concentration in water column was in the range from 30.9 - 51.5 µg/l (>30 µg/l) at Thi Nai pond; the arsenic (As) concentration in water at Bach Dang river mouth, Da Nang bay, Thi Nai pond was 12.52 - 14.26 µg/l; 23.08 -
30.30 µg/l; 6.80 - 20.00 µg/l respectively (>10 µg/l); The residue concentration of DDT group was in low range, but DDD and DDE concentrations were over limitation ( > 4 ng/l) at all three areas. So, the water quality not only seasonally fluctuated but also in was at risk of pollution by many different environmental parameters.