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建立了以纳米ZnO作为固体吸附剂,悬浮于表面活性剂相中,协同浊点萃取技术分离和预富集痕量Cd2+和Ca2+的微萃取方法。纳米ZnO悬浮于非离子型表面活性剂Triton X-114溶液中,增加了辅助的固相,样品溶液中待测的金属离子则被吸附于纳米粒子上。经过60℃浊点萃取相分离后,纳米ZnO携带Cd2+和Ca2+沉降于表面活性剂Triton X-114相中。加入4.0 mol/L HNO3进行待测离子的解吸,通过离心分离,将解吸液以火焰原子吸收光谱法测定。实验对影响萃取和测定的参数进行了优化,Cd2+和Ca2+的检出限分别为0.012和0.14μg/L。方法已用于自来水样中Cd2+和Ca2+的测定。
A microextraction method was developed for the separation and preconcentration of trace Cd2 + and Ca2 + with nano-ZnO as a solid adsorbent, suspended in a surfactant phase, and synergistic turbidimetry. The nano-ZnO is suspended in the non-ionic surfactant Triton X-114 solution to increase the auxiliary solid phase, and the metal ions to be measured in the sample solution are adsorbed on the nano-particles. After 60 ℃ cloud point extraction phase separation, nano-ZnO carrying Cd2 + and Ca2 + settling in the surfactant Triton X-114 phase. Desorption of the ions to be tested was carried out by adding 4.0 mol / L HNO3, and the desorption solution was separated by centrifugation and determined by flame atomic absorption spectrometry. The parameters affecting extraction and determination were optimized. The detection limits of Cd2 + and Ca2 + were 0.012 and 0.14μg / L, respectively. The method has been applied to the determination of Cd2 + and Ca2 + in tap water samples.