石墨炉原子吸收光谱法直接测定电子级二乙二醇甲醚中Cd含量

Determination of Cd in electronic grade diethylene glycol monomethyl ether by graphite furnace atomic absorption spectrometry

利用石墨炉原子吸收光谱仪,通过标准加入法直接测定电子级二乙二醇甲醚（DGME）中的Cd含量。对分析线、石墨管类型、基体改进剂、仪器分析条件等进行了研究,并对实验精密度、加标回收率等进行了测定。实验结果表明：分析线选择228.8 nm,以10 g/L酒石酸加3 g/L硫酸铵作复合基体改进剂,灰化温度为900℃,原子化温度为1 900℃,线性关系良好,线性方程为y=0.160 8x＋0.096 9,相关系数R=0.999 3。方法相对标准偏差〈4.28%,检出限为0.273μg/L,加标回收率为95.0%~103.4%之间。该检测方法简单、快速、准确。

The rapid and direct determination of trace Cd in electronic grade diethylene glycol ether by graphite furnace atomic absorption spectrometry with standard addition method has been developed, using the best matrix modifier. The analysis line, different types of graphite tube, matrix modifier, instrument analysis conditions including ashing temperature and atomization temperature, are studied. In addition, the precision and the recovery rate of the experiment are determined. The results are shown as follows ：228.8 nm of analysis line, the mixture of 10 g/L tartaric acid and 3 g/L ammonium sulphate as matrix modifier, 900℃ and 1 900℃ of ashing temperature and atomization temperature, respectively. Under this condition, a good linear relationship is achieved with correlation coefficient of 0. 999 3,relative standard deviation range less than 4. 28% and the limit of quantification （LOQ） of 0. 272 7 ng/mL. The recovery rate is 95.0% - 103.4%. It indicates that graphite furnace atomic absorption spectrometry is an accurate and precise method for determination of Cd.