分光光度法测定铝表面成膜剂中的氟硼酸根

摘要

氟硼酸根能与苯羟乙酸以氢键结合,再与Fe(Phen)3]2+结合生成具有较大疏水基团的化合物,其具有可被有机试剂萃取的性质.萃取后,采用分光光度法测Fe2+,进而确定氟硼酸根的浓度.通过实验确定了最佳条件:萃取剂为1,2--氯乙烷,Fe(Phen)3]2+3.0 mL,1,2-二氯乙烷4.0mL,pH值为7.5,萃取振荡和静置时间分别为5 min和10 min,最大吸收波长为512 nm.该方法操作简单,共存因素无干扰,用于铝材成膜剂中氟硼酸根的测定,结果令人满意.%Fluoride borate can combine hydroxylated acid with hydrogen bonds, then further combine [Fe(Phen)3]2+ to form a compound with a big hydrophobic group, which can be extracted by organic reagent. After extraction, Fe2+ can be determined by spectrophotometry, and then the concentration of fluoride borate can be determined. The optimal conditions are determined by experiments: extractant is 1,2-dichloroethane, [Fe(Phen)3]2+ 3. 0 mL, 1,2-dichloroethane 4. 0 mL, pH 7. 5, vibrating time 5 min, vibrating laying time 10 min and maximum of wavelength absorbance 512 nm. This method is easy in operation with no interference by co-factors. It is satisfactory to use this method to determine fluoride borate in aluminum film former.