甲醛与4-氨基-3-联氨-5-巯基-1,2,4-三氮杂茂（简称AHMT）溶液在碱性条件下缩合，然后经高碘酸钾氧化成6-巯基-5-三氮杂茂(4,3-b)-S-四氮杂苯紫红色化合物，其颜色的深浅与甲醛含量成正比。方法的最大吸收波长为554nm，甲醛含量在0~12μg·10mL-1范围内具有良好的线性关系，相关系数为0.9959，用于测定有机实验废水中微量甲醛的含量，相对标准偏差为3.45%，加标回收率在95.4%~110.5%之间。%Formaldehyde comdersed with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (hereinafter referred to as AHMT) in alkaline solution condition, and then oxidized by potassium periodate to 6-mercapto-5-triazole (4,3-b)-S-tetrazine purplish red compounds, the color depth was proportional to the content of formaldehyde. The maximum absorption wavelength was at 554 nm. Formaldehyde content in 0~12μg/10mL range had a good linear relationship, the correlation coefficient was 0.9959. The method was used to determine the content of trace formaldehyde in the organic experiment wastewater, the relative standard deviation was 3.45%(n=5), the recovery of standard addition was 95.4%~110.5%.
展开▼
