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目的探讨工作场所空气中低苯酚的全自动流动注射化学分析方法。方法工作场所空气中的苯酚被0.2 g/L碳酸钠溶液吸收后,用多通道全自动流动注射分析仪,经在线蒸馏的方法使挥发性酚蒸馏,并与干扰物质和固定剂分离,被蒸馏出的酚,在p H为10.0±0.2的介质中,在铁氰化钾的存在下,与4-氨基安替比啉反应生成橙红色的安替比啉染料,在510 nm的波长下被检测。结果在浓度为2.0~200.0μg/L范围内呈线性关系,r≥0.999 9,方法检出限为0.14μg/L,最低检出浓度为0.01 mg/m3(以采集7.5 L空气样品计)。相对标准偏差为0.10%~2.34%,加标回收率98.2%~101.0%。结论该法操作简便、灵敏度高、检出限低、检测时间短,适用于实验室大批量低浓度样品的检测。
Objective To investigate the automatic flow injection chemical analysis of low phenol in the air of workplace. Methods Phenol in the air of the workplace was absorbed by 0.2 g / L sodium carbonate solution and distilled by a multichannel automated flow injection analyzer through an in-line distillation process, separated from interfering substances and fixatives, and distilled Phenol, reacted with 4-aminoantipyrine in the presence of potassium ferricyanide in a medium with p H of 10.0 ± 0.2 to form an orange-red antipyrine dye at a wavelength of 510 nm Detection. The results showed a linear relationship in the concentration range of 2.0 ~ 200.0μg / L with r≥0.9999. The detection limit of the method was 0.14μg / L and the lowest detection limit was 0.01 mg / m3 (7.5L air sample was collected). The relative standard deviations were 0.10% ~ 2.34%. The spiked recoveries ranged from 98.2% to 101.0%. Conclusion The method is simple, high sensitivity, low detection limit and short detection time. It is suitable for the detection of high-concentration and low-concentration samples in laboratories.