浊点萃取预富集-石墨炉原子吸收光谱法测定水样中的痕量镍
Determination of trace nickel in water samples by cloud point extraction preconcentration coupled with graphite furnace atomic absorption spectrometry.
作者信息
Sun Zhimei, Liang Pei, Ding Qiong, Cao Jing
机构信息
Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
出版信息
J Hazard Mater. 2006 Sep 21;137(2):943-6. doi: 10.1016/j.jhazmat.2006.03.021. Epub 2006 Mar 24.
A new method based on the cloud point extraction (CPE) preconcentration and graphite furnace atomic absorption spectrometry (GFAAS) detection was proposed for the determination of trace nickel in water samples. When the micelle solution temperature is higher than the cloud point of surfactant p-octylpolyethyleneglycolphenyether (Triton X-100), the complex of Ni2+ with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) could enter surfactant-rich phase and be concentrated, then determined by GFAAS. The main factors affecting the cloud point extraction were investigated in detail. An enrichment factor of 27 was obtained for the preconcentration of Ni2+ with 10 mL solution. Under the optimal conditions, the detection limit of Ni2+ is 0.12 ng mL(-1) with R.S.D. of 4.3% (n = 10, c = 100 ng mL(-1)). The proposed method was applied to determination of trace nickel in water samples with satisfactory results.
提出了一种基于浊点萃取（CPE）预富集和石墨炉原子吸收光谱法（GFAAS）检测的新方法，用于测定水样中的痕量镍。当胶束溶液温度高于表面活性剂对辛基聚乙二醇苯基醚（Triton X - 100）的浊点时，Ni2 +与1 - 苯基 - 3 - 甲基 - 4 - 苯甲酰基 - 5 - 吡唑啉酮（PMBP）的络合物可进入富含表面活性剂的相并被富集，然后通过GFAAS进行测定。详细研究了影响浊点萃取的主要因素。用10 mL溶液对Ni2 +进行预富集时，富集因子为27。在最佳条件下，Ni2 +的检出限为0.12 ng mL(-1)，相对标准偏差为4.3%（n = 10，c = 100 ng mL(-1)）。该方法应用于水样中痕量镍的测定，结果令人满意。
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