铬蓝黑R负载活性炭对Cr（Ⅲ）和Pb（Ⅱ）的吸附性能

研究了新型吸附材料铬蓝黑R（钙试剂）负载改性的活性炭对样品中Cr（Ⅲ）和Pb（Ⅱ）的固相萃取（SPE）并用电感耦合等离子体-原子发射光谱法（ICP-AES）进行检测.优化了pH值、吸附剂用量、流速等条件以达到定量吸附（≥95％）,同时研究了洗脱剂的最佳洗脱条件以及共存离子干扰等问题.本法测定Cr（Ⅲ）和Pb（Ⅱ）的检出限分别为0.91ng·mL-1和0.65ng·mL-1,将其应用于土壤沉积物、猪肝、黄河水中的Cr（Ⅲ）和Pb（Ⅱ）含量的测定,加标回收率在98％-101％之间；用于测定标准物质中Cr（Ⅲ）和Pb（Ⅱ）的含量,结果与标准物参照值一致.

Adsorptivity of A New Sorbent Eriochrome Blue Black R Modified Activated Carbon on Cr(Ⅲ) and Pb(Ⅱ)

A new sorbent eriochrome blue black R modified activated carbon was prepared as a solid-phase extractant and applied for separation,preconcentration and determination of Cr （ Ⅲ ） and Pb（Ⅲ ） in aqueous solutions by tCP-AES. The optimum pH value for the separation of Cr（ Ⅲ ） and Pb （ Ⅲ ） on the newly sorbent was 4.0 and complete elution of Cr （ Ⅲ ） and Pb （Ⅱ ） from the sorbent surface was carried out using 2mL of 0.01mol·L-1 HC1. The adsorption capacity for Cr（ Ⅲ） and Pb （ 11 ） was 17.9 and 26.7mg·g-1. The detection limits of the method defined by IUPAC were found to be 0. 91 and 0. 65ng·mL-1. The method has been applied for the determination of Cr（ Ⅲ ） and Pb （ Ⅱ ） in certified reference materials and natural water samples with satisfactory results.