沉积物对测定地表水重金属中铁和锰的影响

The Influence of the Sediments on the Determination of Heavy Metals Fe and Mn in the Surface Water

黄河水在太原境内含沙量比较大,所携带的泥沙对实际测定重金属有一定的影响。通过对地表水水样前处理影响因素的交叉试验,研究了沉积物对测定地表水重金属铁、锰的影响,得到了一些有参考意义的结论。基于实验结果,指出直接测定含沉积物水样中的铁、锰要比过滤掉沉积物后的水样结果偏高很多,并且验证了重金属在沉积物中的吸附-解吸对pH值具有依赖性。

The sand content of the water of Yellow River in Taiyuan is larger,the sediment carried has a certain influence pn the actual determination of heavy metals.Through a cross test of the influencing factors on surface water sample pretreatment,this paper studies the influence of the of the sediments on the heavy metals Fe and Mn in surface water,and gets some conclusions withs reference significance,and based on the test findings,points out that the result of direct determination of Fe and Mn in water samples containing sediments is much higher that in water samples containing no sediments,and verifies that the adsorption-desorption of heavy metals in sediments depends on pH value.