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采用一种抑制型离子色谱检测技术——不完全抑制电导检测,以0.75 mmol/LNa_2SO_4+NaOH(pH=11.5)为淋洗液对弱酸根离子如苹果酸、酒石酸等进行了测定.得到苹果酸、酒石酸的检测限分别为1.31 mg/L、3.04 mg/L;在200mg/L以下相关系数分别为0.9998、0.9999;各离子峰高的相对标准偏差(RSD)分别为0.57%、1.60%(n=7).回收率为97.7%～104%.常见的强酸离子不干扰测定.用这种方法测定了饮料中的苹果酸,结果较满意.
The determination of weak acid ions such as malic acid and tartaric acid with 0.75 mmol / L Na 2 SO 4 + NaOH (pH = 11.5) as eluent was carried out using a suppressed ion chromatography detection technique - incompletely suppressed conductivity detection. , And the detection limits of tartaric acid were 1.31 mg / L and 3.04 mg / L, respectively. The correlation coefficients (RSDs) were 0.9998 and 0.9999 respectively under 200mg / L; the relative standard deviations (RSDs) were 0.57% and 1.60% = 7) .The recovery rate was 97.7% ~ 104% .The common strong acid ion did not interfere with the determination.Using this method to determine the malic acid in the beverage, the result was satisfactory.