交联羧甲基魔芋葡甘聚糖微柱预富集-GFAAS测定痕量铅、镉、铜的研究

建立了用交联羧甲基魔芋葡甘聚糖(CCMKGM)作为微柱预富集填料，分离富集-GFAAS测定环境水样中痕量铅、镉和铜的新方法。研究了溶液酸度、样品的流速和体积、洗脱剂的浓度和体积、共存离子等对CCMKGM微柱吸附重金属离子的影响。结果表明:在pH为5.0～7.0的条件下，三种重金属离子可定量吸附在CCMKGM微柱上;采用1.0 mL 0.5 mol·L-1的盐酸溶液可将吸附在CCMKGM微柱上的铅、镉和铜定量洗脱。Pb2+, Cd2+, Cu2+的检出限(3σ)分别为0.038, 0.000 5和0.014 μg·L-1,相对标准偏差(RSD)分别为3.5％, 9.2％和4.7％(初始浓度c_Pb2+ =c_Cu2+=1.0 μg·L-1, c_Cd2+=0.1 μg·L-1，n= 11)，富集倍数50。将该法用于环境标准样品的测定，测得值与标准值相符。

Crosslinked Carboxymethyl Konjac Glucomannan Microcolumn Preconcentration of Trace Lead,Cadmium and Copper in Water Samples and Determination by Graphite Furnace Atomic Absorption Spectrometry

A novel solid phase extraction technique was developed for the determination of trace lead,cadmium and copper in environmental water samples based on separation and preconcentration with a microcolumn packed with crosslinked carboxymethyl konjac glucomannan(CCMKGM)prior to its determination by graphite furnace atomic absorption spectrometry.Various influential factors on the separation and preconcentration of lead,cadmium and copper,such as the acidity of the aqueous solution,sample flow rate and volume,and...