ENVIRONMENT L QUALITY OF THUY TRIEU LAGOON, I KHANH HOA PROVINCE

Le Thi Vinh

Abstract


Results ofinvestigations in 2005-2006 indicated that water quality ofThuy
Trieu Lagoon was relatively good although concentrations of ammonia, nitrate, and phosphate were sometimes higher than the maximum allowable value regard to waters for mariculture (70 j.lg/1 for NH3.rN; 100 j.lgll for NOrN; 15 j.lg/1 for POrP) and DO concentration was rarely below the minimum value of5 mg/1. The values ofparameters were rangedfrom 22. 2 to 45.2rng!lJor total suspended solids; 4.8- 7.40 mgllfor DO; 15.3- 37.3 mg/lfor COD; 0.3- 5.0 f.lgN/lfor N01 ; 44- 155 f.lgN/lfor N03 ; 0- 84 JLgN/lfor NH3.4; 3.6-25.6 j.lgP/lfor P04 ; 232- 146kl j.lgSi!lfor Si03; 436- 786 JlgN!lfor organic N; 27.5-44. 5 j.lgP/lfor organic P.
For sediment quality, c6mtent oforganic matters was not high (organic Carbon from 0.1 to 1.3 %; organic N from 710 to 1294 Jlglg and total P from 16. 3 to 716 j.lglg} , they were mainly terrigenous in origin.
Environmental quality dfThuy Trieu Lagoon did not show big difference compared to studied results in the 2002-200Bperiod except for high concentration ofammonia in October, 2003 (maximum : 296 j.lgN/1)


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DOI: https://doi.org/10.15625/1859-3097/9/1/6253

Journal of Marine Science and Technology ISSN: 1859 3097

Published by Vietnam Academy of Science and Technology