DETERMINATION OF CADMIUM, COPPER AND LEAD IN ENVIRONMENTAL-SAMPLES - AN EVALUATION OF FLOW-INJECTION ONLINE SORBENT EXTRACTION FOR FLAME ATOMIC-ABSORPTION SPECTROMETRY
DETERMINATION OF CADMIUM, COPPER AND LEAD IN ENVIRONMENTAL-SAMPLES - AN EVALUATION OF FLOW-INJECTION ONLINE SORBENT EXTRACTION FOR FLAME ATOMIC-ABSORPTION SPECTROMETRY
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DOI：
10.1016/0003-2670(94)85005-4
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发表时间：
1994-01-20
影响因子：
6.2
通讯作者：
ADAMS, F
中科院分区：
文献类型：
--
作者：
MA, RL;VANMOL, W;ADAMS, F
以十八烷基官能团（C18）键合硅胶为吸附剂，二乙基铵- n， n-二乙基二硫代氨基甲酸酯（DDDC）或二乙基二硫代磷酸铵（DDPA）为络合剂，甲醇为洗脱剂，建立了流动注射在线吸附萃取系统，结合火焰原子吸收光谱法测定固体环境样品消解溶液中的镉、铜和铅。以DDDC为络合剂，柠檬酸为铁、锰的掩蔽剂。络合剂DDPA在pH值为1 ~ 3时选择性地萃取镉、铜和铅。采用DDPA与柠檬酸在pH 1.0条件下络合，对粉煤灰（CRM 038）、钙质壤土（CRM 141）、湖泊底泥（CRM 280）、河流底泥（CRM 320）、河口底泥（CRM 277）等5种环境标准参考物质进行消解后的分析，除含铁量很高的河流底泥中镉外，其余均与认证值吻合较好。在8.7 ml min-1条件下，20 s样品上样时，镉、铜和铅的检出限（3sigma）分别为0.8、1.4和10.0马克杯-1。
A flow injection on-line sorbent extraction system was studied in conjunction with flame atomic absorption spectrometry to determine cadmium, copper and lead in digest solutions of solid environmental samples using octadecyl functional groups (C18) bonded silica gel as sorbent with diethylammonium-N,N-diethyldithiocarbamate (DDDC) or ammonium diethyldithiophosphate (DDPA) as complexing agent and methanol as eluent. Using DDDC as complexing agent, citric acid was used as masking agent for iron and manganese. The complexing agent DDPA selectively extracts cadmium, copper and lead at pH values 1 to 3. Using DDPA as complexing agent with citric acid at pH 1.0, the results of the analysis of five environmental standard reference materials, including coal fly ash (CRM 038), calcareous loam soil (CRM 141), lake sediment (CRM 280), river sediment (CRM 320) and estuarine sediment (CRM 277) after digestion were in good agreement with the certified values except cadmium in the river sediment with a very high iron content. With a 20-s sample loading at 8.7 ml min-1 detection limits (3sigma) were 0.8, 1.4 and 10.0 mug l-1 respectively for cadmium, copper and lead.