电感耦合等离子体发射光谱法测定矿泉水中氯

Determination of chlorine in water by inductively coupled plasma-atomic emission spectrometry

目的建立利用电感耦合等离子体发射光谱仪(ICP-OES)检测矿泉水中氯的分析方法。方法样品经0.22μm水系膜过滤处理后,分别选择谱线858.597 nm和894.800 nm作为检测波长,用电感耦合等离子体发射光谱仪(ICP-OES)进行检测,同时与国家标准推荐的离子色谱法的测定值进行比较。结果选择Cl 858.597 nm和Cl894.800 nm为分析谱线,当标准系列溶液的浓度为5μg/ml^50μg/ml时,线性方程分别为y=134.87x+33.575、y=100.36x-87.418,相关系数(r)分别为0.9999、0.9993,相对标准偏差(RSD)分别为7.42%、3.12%。6份已知氯含量的矿泉水样品的加标回收率为95.69%~105.45%。电感耦合等离子体发射光谱法与国家标准方法 -离子色谱法检测数据吻合度较高,用其测定矿泉水中氯化物的含量具有较高的准确度。结论本法测定水中氯化物与国家标准离子色谱法相比,具有操作简便、分析速度快和准确度较高等优点,可以满足矿泉水中氯化物的检测需求。

Objective To develop an inductively coupled plasma atomic emission spectroscopy method（ ICP- OES） for the determination of chlorine in natural mineral drinking water. Methods Samples were filtered by 0. 22 μm syringe filters,and then detected by ICP- OES. Line 858. 597 nm and 894. 800 nm were chosen as the detection wavelength. The detection results were compared with the estimated value by national standard recommended method- ion chromatography simultaneously. Results Good linearity was obtained when the concentration of standard solutions was within 5 μg/ml- 50 μg/ml under the line 858. 597 nm and 894. 800 nm,and the regression equations were y = 134. 87 x ＋ 33. 575 and y = 100. 36x- 87. 418,with the correlation coefficients of 0. 999 9 and 0. 999 3,and the relative standard deviation were 7. 42% and 3. 12%,respectively. The recovery of6 samples of mineral water containing known chloride content was within 95. 69%- 105. 45%. The detection data of ICP- OES was high coincident to that of national standard method- ion chromatography,which had high accuracy in the determination of chloride content in mineral water. Conclusion Compared with the national standard method- ion chromatography,and its advantages are simple operation,high analysis speed and accuracy,which can reach the demand of determination of chloride in mineral water.