杭州湾漕泾沿岸水化学状况

Hydrochemistry of the coast along Caojing, Hangzhou Bay

报道了 2 0 0 1年 1- 12月杭州湾畔金山漕泾地区用于水产养殖的河口沿岸水化学状况 :总含盐量 (12 .2 4± 1.92 )g/L ,碱度 (2 .12± 0 .2 7)mmol/L ,pH值为 7.99± 0 .11,阴阳离子中含量最高者分别为Cl-(6 .6 4± 1.0 4)g/L与Na+ +K+ (3.76± 0 .6 0 )g/L ,属典型河口区水质特点 ,系海水水质类型 (ClNaⅢ)。常规水质指标如下 :Nt为 (1.32± 0 .44 )mg/L ,其中NH3 Nt占 19.7%,NO-3 N占 78.8%,NO-2 N占 1.6 %,活性磷PO3 -4 P含量为 (2 .0 4± 1.5 7) μg/L ,氮磷比 (N/P)为 6 47(原子比 ) ;化学需氧量 (CODMn)为 (6 .89± 1.76 )mg/L ;五日生化需氧量(BOD5)为 (2 .5 6± 0 .5 2 )mg/L ;溶解氧 (DO)为 (7.95± 0 .5 6 )mg/L。

Hydrochemistry of the coast along Caojing,Hangzhou Bay was studied from January to December in 2001. The results are summarized as follows: total salt content was about(12.24±1.92)g/L; alkalinity was (2.12± 0.27)mmol/L, and pH was 7.99±0.11; Cl -(6.64±1.04)g/L and Na ++K +(3.76±0.60)g/L were the richest among those anions and positive ions, thus water of this area had obvious estuary characteristics and subordinated to seawater style, namely Cl Na Ⅲ; contents of effective nitrogen (Nt) in the area were rich and Nt content reached (1.32±0.44)mg/L, with NH 3-N amounting to 19.7%, NO - 3-N amounting to 78.8% and NO - 2-N amounting to 1.6%; content of active phosphorus was ( 2.04±1.57)μg/L and N/P was 647; the chemical oxygen demand (COD Mn) was (6.89±1.76)mg/L; the biochemical oxygen demand (BOD 5) was (2.56±0.52)mg/L; dissolved oxygen(DO) was (7.95±0.56)mg/L.