分光光度法测定水中氟离子的优化
戴培勤,耿庆涛,于海燕
山东中节能天融环保技术有限公司,山东潍坊 261000
Determination of fluoride ion in water by ultraviolet spectrophotometry
DAI Peiqin, GENG Qingtao, YU Haiyan
Shandong Zhongjieneng Tianrong Environmental protection technology Co., Ltd, Weifang 26100, China
摘要:氟离子在弱酸性缓冲介质中与显色剂反应生成蓝色三元络合物,络合物在620 nm波长处的吸光度与氟离子浓度成正比,据此建立检测水中氟化物含量的分光光度法。研究了缓冲液和显色剂加入量、络合物稳定剂、稳定时间对测定结果的影响,并确定了最佳分析条件:向适量水样中加入1 mL缓冲液、1 mL显色剂、1 mL乙醇,静置20 min,在此实验条件下,氟化物的质量浓度在0~2μg/mL的范围内与吸光度具有良好的线性关系,线性相关系数为0.999 5,检出限为0.01μg/mL,测定低浓度水样的相对标准偏差为1.6%(n=8),测定废水的加标回收率为97.7%。该方法操作简单,测试结果准确度和精密度较高,可满足水和废水中氟化物含量测定的要求,采用较少的试剂并用低毒性的乙醇替代丙酮可以降低环境污染,并为开发氟化物在线设备提供参考。
Abstract:Based on the reaction of fluoride ion with chromogener in weak acid buffer medium to form blue ternary complex, the absorbance of the complex at 620 nm was proportional to the concentration of fluoride ion, a spectrophotometric method for the determination of fluoride content in water was established. The effects of dosage of chromogenic agent and buffer, complex stabilizer and stabilization time on the determination results were studied and the optimal analysis condition was as follows: the addition amount of chromogenic agent, buffer and ethanol was all 1 mL, and the reduction time was 20 min. The mass concentration of fluoride had a good linear relationship with absorbance in the range of 0-2μg/mL, the linear correlation coe?cient was 0.999 5, the detection limit was 0.01μg/mL. The relative standard deviation of determination results was 1.6% (n=8), and the recovery was 97.7%. The method is simple to operate with high accuracy and precision, which can be used to determine ?uoride in water.
关键词:氟化物;分光光度法;丙酮;乙醇
Keywords:?uoride; spectrophotometry; acetone; ethanol
本文引用格式:
戴培勤,耿庆涛,于海燕.分光光度法测定水中氟离子的优化[J].化学分析计量,2022,31(4):69.
DAI Peiqin,GENG Qingtao,YU Haiyan. Determination of ?uoride ion in water by ultraviolet spectrophotometry[J]. Chemical analysis and meterage,2022,31(4):69.
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