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在化学键合固定相ODS柱上,用Fe(Phen)_3~(2+)作流动相添加剂分离并用间接光度法检测无机阴离子。探讨了主要因素(如流动相中Fe(Phen)_3~(2+)浓度、有机溶剂浓度、pH值和离子强度等)对阴离子保留和检测灵敏度的影响。Cl~-,Br~-,NO_3~-和I~-具有良好的分离度;间接光度检测波长为Fe(Phen)_3~(2+)的最大吸收波长510nm。测定这4个离子的校正曲线的线性范围为1~160mg/L(Cl~-,Br~-,NO_3~-)和2~320mg/L(I~-);相关系数均达0.996。检测限(以S=2N计)分别为1.0ng(Cl~-),1.7ng(Br~-),1.9ng(NO_3~-)和5.6ng(I~-)。方法应用于雨水和自来水中Cl~-的测定,并获得满意的结果。
On the chemically bonded stationary phase ODS column, Fe (Phen) _3 ~ (2+) was used as the mobile phase additive to separate the inorganic anions by indirect spectrophotometry. The main factors (such as the mobile phase of Fe (Phen) 3 ~ (2) concentration, organic solvent concentration, pH value and ionic strength) on anion retention and detection sensitivity were discussed. Cl ~ -, Br ~ -, NO_3 ~ - and I ~ - have good resolution. Indirect photometric detection wavelength is the maximum absorption wavelength of 510nm for Fe (Phen) _3 ~ (2+). The calibration curves of these four ions were linear in the range of 1 ~ 160mg / L (Cl ~ -, Br ~ -, NO_3 ~) and 2 ~ 320mg / L (I ~ The limits of detection (S = 2N) were 1.0ng (Cl ~ -), 1.7ng (Br ~ -), 1.9ng (NO_3 ~) and 5.6ng (I ~ ~), respectively. The method was applied to the determination of Cl ~ - in rainwater and tap water and obtained satisfactory results.