进口朝鲜无烟煤中汞含量及特征分析  

Content and feature analysis of mercury in import Korea anthracite

作　　者：杨常青[1] 张双双[1] 侯艳娜[1] 李芳[1] 甄建辉[1] 徐志彬[2] 

机构地区：[1]河北出入境检验检疫局唐山港办事处,河北唐山063600 [2]河北出入境检验检疫局曹妃甸办事处,河北唐山063600

出　　处：《洁净煤技术》2016年第3期98-101,107,共5页Clean Coal Technology

基　　金：国家质检总局科技资助项目(2014IK270)

摘　　要：为建立进口朝鲜无烟煤中汞含量的检测方法,评价其分布特征及环境迁入风险,通过微波消解-原子荧光法（MD-AFS）对其进行准确定量,采用稳健统计技术描述总体含量特征,依据我国质量分级标准对其进行评价。结果表明,硝酸-硫酸-氢氟酸（6∶4∶0.5）作为消解试剂,消解温度205℃,可将无烟煤样品彻底消解,方法回收率可达98%以上,校准曲线在0~0.8 ng/m L线性关系良好,相关系数大于0.999 5,方法检出限为0.023μg/g。经t检验,该方法与测汞仪测汞法无统计学意义上的差异。该方法能将有机质含量特别高的无烟煤样品消解彻底。经稳健统计技术统计,唐山港进口的朝鲜无烟煤平均汞含量为0.611μg/g,其中87%为中、高汞煤,大量进口使用易造成我国大气环境的严重汞污染,应该加强对进口朝鲜无烟煤的监管与防控。In order to establish detection method of Hg content in Korea anthracite and evaluate the distribution characteristics and environmental immigration risk,the microwave digestion-atomic fluorescence spectrometry（MD-AFS） method was used to determine mercury,the robust statistics technique was used to describe the feature of overall content of mercury,the quality was evaluated based on China grading standard. The results showed that,the anthracite samples could be completely digested when the digestion system was nitric acid-sulfuric acid-hydrofluoric acid（6∶ 4∶ 0. 5） and the digestion temperature was 205 ℃. The recovery rate of the methods could reach above98%. Calibration curve had good linear relationship in the range of 0 ~ 0. 8 ng / m L,the correlation coefficient was bigger than 0. 999 5 and the method detection limit was 0. 023μg / g. There was no statistically significant difference between MD-AFS and the direct mercury analyzer method. The anthracite coal samples with high organic matter content could be thoroughly digested by this method. According to the robust statistics of testing data,average content of imported Korea anthracite of mercuryin Tangshan port was 0. 611 μg / g. Eighty-seven percent was middle-high mercury coal. Widespread use of import Korea anthracite would easily cause serious mercury pollution to environment,so the supervision and control of imported Korea anthracite should be strengthened.

关 键 词：无烟煤 微波消解 原子荧光 汞污染 稳健统计 

分 类 号：TS254.7[轻工技术与工程—水产品加工及贮藏工程]