The ion selective electrode method was used to determine fluoride in soil samples.In order to improve the accuracy of the measurement results,it is necessary to use the total ion strength adjustment buffer in the measurement experiment.TISAB1 and TISAB2 buffers were selected for comparison experiment.The results show that the three test results of TISAB1 buffer are within the specified range of guaranteed value,which can better meet the need of improving the accuracy of fluoride test.The metal ion interference experiment shows that when the concentration of Al3+does not exceed 10 mg/L,the concentration of Fe3+does not exceed 50 Mg/L,and the concentration of Ca2+does not exceed 100 mg/L,the three metal ions will not interfere with the results of fluoride determination.The detection limits of water-soluble fluoride in soil and total fluoride in soil are 2.1 μg and 2.2 μg respectively,which can meet the requirements of soil environmental fluoride determination.
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