长江口近岸表层沉积物中基质结合态磷化氢的分布特征

Distributions of Matrix-Bound Phosphine in Surface Sediments of the Yangtze Estuary

利用气相色谱-脉冲火焰光度检测器(GC-PFPD)分析了长江口近岸表层沉积物中基质结合态磷化氢(MBP)的含量,并探讨了其潜在的影响因素.结果表明,5月沉积物中MBP的含量略高于11月,其含量变化范围分别为139～426 ng.kg-1和111～192 ng.kg-1,平均含量分别为224 ng.kg-1和158 ng.kg-1;并且,沉积物中MBP的含量存在显著的地理空间差异.此外,MBP含量与环境参数之间的相关分析显示,MBP与总磷(TP)、无机磷(IP)、有机磷(OP)有较好的线性关系(RTP=0.86,P<0.000 1;RIP=0.81,P<0.000 1;ROP=0.90,P<0.000 1),与碱性磷酸酶活性(APA)、pH的相关性较弱(RAPA=0.55,P=0.019;RpH=0.511,P=0.03),表明沉积物中MBP的含量与磷组分、APA及pH密切相关,但与有机碳、盐度等环境因子并无显著相关性.

Concentrations of matrix-bound phosphine（MBP） in the surface sediments of the Yangtze Estuary were investigated in the present study using gas chromatography coupled with a pulsed flame photometric detector（GC-PFPD）,and the potential environmental factors were discussed.It was shown that the MBP concentrations were relatively higher in May than in November,with the ranges of 139-426 ng·kg-1 and 111-192 ng·kg-1,respectively.Also,there was the significant spatial difference in MBP concentrations at the study area.In addition,it was observed that MBP was significantly related to TP,IP,OP,pH,and activities of APA in the surface sediments.However,no significant correlations were found between MBP,organic carbon and salinity.