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铬天青S(CAS)-溴代十四烷基吡啶(TPB)阳离子胶束增溶比色法测定铝有较高的灵敏度,但条件要求较严(pH为5.8—6.0),实际工作中不易控制,稳定性欠佳。作者参阅资料,采用阳离子、非离子混合型表面活性剂,比单一的阳离子表面活性剂体系有较宽的酸度范围(pH为5.6—7.0)达到了增敏、增稳、增溶的优点,突出了铅离子的选择性。用Al-CAS-OP-TPB体系混合胶束测定镍、钴中的微量铝,方法的摩尔吸光系数达到1.15×10~5。主要试剂铬天青S(CAS)溶液[0.1％乙醇(1+1)];乳化剂(OP)溶液(0.1％(V/V);乙酸-乙酸铵缓冲液:将485mL 4 mol/L的乙酸铵溶液用4 mol/L的乙酸溶液稀至500mL;苯甲酸铵溶液(12％):苯甲酸铵洗液(2％)用稀盐酸在酸度计上调节pH为4.6～4.8;苯甲酸乙酸乙酯溶液(5％);钴标准溶液[0.1mg/mL(盐酸介质)]。吸收光谱在Al-CAS-TPB体系中引入乳化剂
Chromium Azure S (CAS) - Brominated tetradecyl pyridine (TPB) cationic micellar solubilization colorimetric determination of aluminum has a higher sensitivity, but the conditions require more stringent (pH 5.8-6.0), the actual work Not easy to control, poor stability. The authors refer to the information, the use of cationic, non-ionic mixed surfactant, than the single cationic surfactant system has a wide range of acidity (pH 5.6-7.0) to achieve sensitization, stabilization, solubilization advantages, prominent Lead ion selectivity. The molar extinction coefficient of nickel and cobalt in Al-CAS-OP-TPB mixed micelles was 1.15 × 10 ~ 5. The main reagent was chrome azure S (CAS) solution [0.1% ethanol (1 + 1)]; the emulsifier solution was 0.1% (V / V) Ammonium acetate solution dilute to 500mL with 4mol / L acetic acid solution; ammonium benzoate solution (12%): ammonium benzoate lotion (2%) with dilute hydrochloric acid in the pH meter to adjust the pH of 4.6 to 4.8; benzoic acid acetic acid Ethyl ester solution (5%); cobalt standard solution [0.1 mg / mL (hydrochloric acid medium)]. Absorption spectra The emulsifier