地下水氟含量测定及测定影响因素研究

Determination of Fluoride Content in Ground Water and Studying on the Affective Factors of the Determination

关键词:  氟  标准曲线法  离子强度  pH值

Key words:  fluoride  calibration  ionic strength  pH value

摘要:

采用电位法测定天津市北辰区西堤头镇地下水氟含量并研究影响测定的条件。取原始水样10.00 ml,测得地下水中含氟量为4.37 μg/ml。测定结果的线性回归方程为E=-64.711lgc(F^-)+355.94,r=0.9997,回收率为97%~101.3%。测定离子含量较低时,离子强度对测定结果影响不大,但是pH值对测定结果影响较大,当控制pH值为5时,测定结果准确。

Abstract:

The fluoride content of ground water in Siditou Town of Beichen District of Tianjin was determined with potentiometric method, of which the affective factors were analyzed.The liner regression equation was E=-64.711lgc(F^-)+355.94,r=0.9997 and the recovery was 97%~101.3%, indicating that the method was accurate.The influence of the ionic strength on the determination was limited when the fluoride content was low,however the solvent pH had a big effect on determination.The result was accurate when the pH value of the solvent was 5.