摘要
根据巯基棉在一定酸性条件下能定量吸附甲基汞的原理,利用多通道并联的固相萃取装置,采用气相色谱(ECD)方法测定饮用水中痕量甲基汞,考察了水样pH值对回收率的影响。方法在0.050 mg/L^1.00 mg/L范围内线性良好,当采样体积为1.0 L时,检出限为0.03 ng/L,标准样品与实际水样平行测定的相对标准偏差均<5.0%,加标回收率均>80%。建议采用全程序空白、溶剂空白、平行样品、加标回收率和实验室质控样等质量控制手段来保证分析数据的准确性。
Adsorbed by sulfhydryl cotton in acidic solution,methylmercury in drinking water was determined by gas chromatograph with ECD.The solid phase extraction was performed by using a multi-channel paralleling device and influence of pH value in water samples on recovery was observed.It was found that good linearity of method obtained in range from 0.050 mg/L to 1.00 mg/L,detection limits 0.03 ng/L at sample volume 1.0 L,RSD of standard and parallel samples 5.0%,spiked recoveries 80%.Some suggestions were made for accurate data by using QA/QC of laboratory including blank through entire procedure along with samples,solution blank,parallel samples,and spiked recoveries.
出处
《环境监测管理与技术》
2011年第1期54-56,60,共4页
The Administration and Technique of Environmental Monitoring
关键词
甲基汞
巯基棉
固相萃取
气相色谱法
饮用水
Methylmercury
Sulfhydryl cotton
Solid phase extraction
Gas chromatography
Drinking water
