优化化学浸提法对造纸白泥中汞形态的分析  

Optimized chemical extraction method for mercury speciation of papermaking white mud

作　　者：王相凤[1] 王凡[1] 王强[1] 张辰[1] 张凡[1] 

机构地区：[1]中国环境科学研究院,北京100012

出　　处：《环境污染与防治》2014年第3期52-55,共4页Environmental Pollution & Control

基　　金：国家"863计划"项目(No.2012AA06A11303;No.2012AA062505);2010年度国家环保公益性行业科研专项(No.201009048)

摘　　要：《固体废物浸出毒性浸出方法水平振荡法》(HJ 557—2010)中规定的固体废物中各形态汞的逐级化学浸提周期较长,制取浸提液时的浸提时间为搅拌后恒温振荡8h,静置16h。对美国环境保护署提出的相关方法(US EPA Method 7471B,固体和固体废弃物中汞的测定(冷原子蒸汽技术))进行了改进,将水溶态汞、酸溶态汞测定的浸提液制取时间设定为搅拌后恒温振荡30min,静置2h(其他2种形态汞测定时未做优化),采用优化的化学浸提法来测定2种造纸白泥样品中不同形态汞的含量。测定结果表明,按照国标方法和优化方法测得的浸提液中水溶态汞、酸溶态汞含量的偏差均小于6%,在可接受的范围(小于10%)内,优化方法的测定结果可靠;不同种类的造纸白泥中各形态汞的分布趋势是相同的,含量分别为水溶态汞>酸溶态汞>过氧化氢溶态汞>残渣态汞;2种造纸白泥样品中所含水溶态汞的比例均较高,这也为造纸白泥的安全资源化利用提供了有利条件。The sequential chemical extraction technique recommend by solid waste-extraction procedure for leaching toxicity-horizontal vibration method （HJ 557-2010） had the disadvantage of long operation period,the leaching time for leaching liquid preparation was 8 h of thermostatic oscillation followed by 16 h of standing. The mercury determi- nation method proposed by US environmental protection agency （US EPA Method 7471B, the determination of mercu- ry in solid and solid wastes （cold atomic vapor technology）） was improved in this paper~ the water soluble mercury and acid soluble mercury leaching liquid was prepared after 30 rain of thermostatic oscillation and 2 h of standing. （The determination of other two mercury speciations was not improved）. The optimized chemical extraction method was used to determine different mercury speciations in two types of white mud collected from papermaking mills. Re- sults showed that the deviation of water soluble mercury and acid soluble mercury measured by national standard method and optimization method was less than 6% ,which was in acceptable range （〈10%）,the detection result was reliable. The mercury speciations in two types white mud presented the similar distribution trend, which was water soluble mercury〉acid soluble mercury〉hydrogen peroxide soluble mercury〉residual mercury. The content of water soluble mercury was relative high in both white mud samples, which provided favorable condition for secure resource utilization of white mud.

关 键 词：造纸白泥 汞形态 化学浸提 

分 类 号：X793[环境科学与工程—环境工程]