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目的检测并分析钱塘江流域地面水污染物的致突变性并探讨其主要危险因素。方法通过Ames试验检测水样致突变性,运用分析化学的方法检测钱塘江流域水样主要理化相关指标,经统计学分析判断这些指标是否是致突变性的危险因素。结果单因素logistic回归分析以及Spearman秩相关分析均显示,流域内18个采样点水样的总重金属质量浓度、总有机物质量浓度和苯并a芘(Bap)质量浓度这3个指标对水样致突变性并没有影响;简单线性回归分析显示,下游干流5个采样点水样的致突变性与p H值呈负相关(β=-2.049,P<0.05),与化学需氧量(COD)呈正相关(β=0.016,P<0.05),而与微囊藻毒素(MC-RR、MC-LR)以及Bap的质量浓度无关。结论钱塘江流域地面水致突变性程度较轻。除p H和COD与致突变性有负相关和正相关以外,尚不能明确判定导致水样致突变性的其他危险因素。
Objective To detect and analyze the mutagenicity of surface water pollutants in the Qiantang River Basin and to explore the main risk factors. Methods The mutagenicity of water samples was tested by Ames test. The main physico-chemical indexes of water samples in Qiantang River Basin were analyzed by analytical chemistry method. The statistical analysis was conducted to determine whether these indexes were risk factors of mutagenicity. Results One-way logistic regression analysis and Spearman rank correlation analysis showed that the three indicators of total heavy metal concentration, total organic matter concentration and mass concentration of benzo [a] pyrene (Bap) The results of simple linear regression analysis showed that the mutagenicity of water samples from five sampling points of the downstream main stream was negatively correlated with the p H value (β = -2.049, P <0.05), but not with the chemical oxygen demand (COD) (Β = 0.016, P <0.05), but not with the concentrations of microcystin (MC-RR, MC-LR) and Bap. Conclusion The groundwater in Qiantang River Basin is less mutagenic. In addition to the negative correlation and positive correlation between p H and COD and mutagenicity, other risk factors leading to mutagenicity in water samples can not yet be clearly determined.