供水管网水中金属元素赋存形态及相关性研究

Speciation and Correlation of Metal Elements in Water Supply System

供水系统中水体的金属元素赋存形态复杂,具有特殊的化学和生物特性,是保障饮用水安全稳定的重要控制指标。以南方N市实际供水管网为研究对象,通过电感耦合等离子体质谱法(ICP-MS)测定了水体中16种金属元素的赋存形态,并分析了各金属之间的相关性。结果表明,该市供水管网中总铝的增加主要是由悬浮态铝的增加引起的;总铁、总锰、总锌的增加主要是由悬浮态和可溶态铁、锰、锌的两种形态同时增加引起的;总钡的变化是由可溶态钡的增加所造成的。管网水中悬浮态铝、铁、锰的含量存在较大的空间差异。Pearson相关性分析显示:悬浮态金属之间,铝与锰、铝与钡、锰与铜、锰与钡呈强正相关性(p<0.01),铝与钛、铝与铜、钛与铁、铜与锌、铜与钡呈中等正相关性(p<0.01)。

The metal elements in water supply systems have complex speciation and special chemical and biological characteristics,which is an important control index to ensure the safety and stability of drinking water.The speciation and correlation of 16 metal elements in a water supply network of N city in southern China were determined by inductively coupled plasma mass spectrometry(ICP-MS).The increase in total aluminum in the water supply network was mainly caused by the increase in suspended aluminum.The increase in total iron,total manganese and total zinc was mainly caused by the increase in suspended and soluble iron,manganese and zinc,and the change in total barium was attributed to the increase in soluble barium.The contents of suspended aluminum,iron and manganese in water of the pipe network had great spatial differences.Pearson correlation analysis showed that there were strong positive correlations between suspended metals,such as aluminum and manganese,aluminum and barium,manganese and copper and manganese and barium(p<0.01),and moderate positive correlations between suspended metals such as aluminum and titanium,aluminum and copper,titanium and iron,copper and zinc and copper and barium(p<0.01).