盐酸苯肼法测腐竹中甲醛研究

Measuring the formaldehyde residues in Yuba with phenylhydrazine hydrochloride method

以水为溶剂,超声提取腐竹中甲醛,用盐酸苯肼分光光度法测定甲醛。研究了盐酸苯肼、铁氰化钾、酸度对显色的影响。结果显示,方法检出限0.001μg/mL,甲醛测定回收率95.6%~104.5%,相对标准偏差RSD 1.99%~3.10%。该方法测定腐竹中微量甲醛具有稳定性好、准确度高、操作简单等特点。

Water as solvent,the extraction of formaldehyde in Yuba by ultrasonic extraction,the formaldehyde was determinated by phenylhydrazine hydrochloride spectrophotometric method.The influence of phenylhydrazine hydrochloride,potassiumferricyanide and acidity on color was studied.Results show that the method detection limit of 0.001μg/mL,the recovery was between 95.6%~104.5%.The RSD was between 1.99%~3.10%.The method is stable,accurate and simple.