固相萃取-电感耦合等离子体原子发射光谱法测废水中的砷

Solid Phase Extraction and Determination of Arsenic in Wastewater by Inductively Coupled Plasma Atomic Emission Spectrometry

采用CTAB在碱性条件下加四乙氧基硅烷，生成白色沉淀后在550℃温度下，灼烧5 h，除去表面活性剂，获得MCM-41介孔材料。将MCM-41介孔材料装柱后，采用固相萃取的前处理方法对样品中砷进行富集,富集倍数达到20倍。建立电感耦合等离子体原子发射光谱法对水样中微量砷的测定方法，方法的检出限为0.01μg/mL，测定范围为0.5-10μg/mL,回收率为91.5%-110%。

Under alkaline conditions , CTAB reacted with four-ethoxy silane to generate white precipitation, then white precipitation was calcined at 550℃ for 5 h to remove surface active agent, at last MCM - 41 mesoporous materials were obtained. The MCM - 41 mesoporous materials were filled in the column, solid phase extraction pretreatment techniques was used to enrich arsenic in the sample with enrichment ratio up to 20 times. Trace arsenic in water sample was determined by the inductively coupled plasma atomic emission spectrometry. The results show that,the detection limit of the method is 0.01 g/mL, determining range is 0.5 - 10 g/mL, and the recovery is 91.5% - 110%.