水体沉降物样品重金属分析的前处理

Pretreatment of heavy metals in water sediments

通过对水体沉降物重金属分析前处理的分析,对影响分析结果准确度的因素进行讨论,得到以下结论:重金属污染分析样品最好盛装在聚乙烯塑料袋中;若样品水分较大时,可用离心和过滤方式分离去水分;制样建议采用行星式玛瑙球磨机,适当增加小球(Φ5 mm)比例;无机重金属分析粒度最好加工到200目,已改善汞结果的离散性。

Through the analysis of pretreatment of heavy metals in sediments, the factors influencing the accuracy of the analytical results are discussed. The following conclusions can be drawn： the analysis samples of heavy metal contamination are best packed in polyethylene plastic bags; If the sample moisture is large, can be centrifuged and filtered to separate moisture; Sample preparation recommended planetary agate ball mill, appropriate to increase the ball（5 mm diameter） ratio; inorganic heavy metal particle analysis of best processing to 200-mesh, and the dispersion of mercury results has been improved.