PVC尼龙6树脂-原子吸收法测定空气中的六价铬

Determination of Cr^(+6) in Air with PVC Nylon-6 Resin-Atomic Absorption Spectrometry

目的 研究PVC尼龙 6树脂 -原子吸收法测定空气中的六价铬。方法 利用PVC尼龙 6树脂分离作业场所空气中的三价铬、六价铬 ,并富集六价铬 ,同时结合火焰原子吸收法建立测定作业场所空气中六价铬化合物含量的PVC尼龙 6树脂 -火焰原子吸收法。结果 使用本方法测定作业场所空气中六价铬化合物的含量 ,当六价铬溶液浓度在 0 1～ 5 0 μg/ml范围内时 ,标准回归方程Y =0 0 712X +0 0 0 12 (Y为吸光度 ,单位 :A ,X为铬溶液浓度 ,单位 :μg/ml) ,相关系数r =0 9995 ,线性良好 ;回收率范围为 95 0 %～ 10 7 4 % ;相对标准差为 3 5 %～ 4 0 % ;方法的样品最低检出浓度为 0 0 0 5mg/m3 。采集 12组样本用国标法与本方法对照 ,差异无显著性 (P >0 0 5 )。结论 本方法用于检测作业场所空气中六价铬化合物时与国标法结果基本相同 ,且具有简单、准确、实用。

ObjectiveTo study the method for determining Cr +6 in air with PVC nylon-6 resin-atomic absorption spectrometry.MethodsPVC nylon-6 resin was used to separate Cr +3 and Cr +6 in workshop environment and to enrich Cr +6 at the same time.Flame-atomic absorption spectrometry was used to Cr +6-compounds.ResultsWithin the concentration range of 0.1 5.0 μg/ml,the linear regression equation was Y=0.071 0.001 2,which worked well with the correlation coefficient r=0.999 5,The recovery rate was 95.0% 107.4%,with RSD of 3.5% 4.0%,The minimum detecting limit was 0.005 mg/m 3.National standard method was used as a control one and results showed no significant difference between these two methods.ConclusionsIt suggests that this method is simple,accurate,feasible,stable and as effective as the national standard one.