Septon J C, Ku J C
Am Ind Hyg Assoc J. 1982 Nov;43(11):845-52. doi: 10.1080/15298668291410675.
A polarographic method has been developed for the determination of formaldehyde in workplace air. Samples are collected in midget fritted glass bubblers containing an aqueous solution of 10% methanol. The collected formaldehyde in the absorbent solution is derivatized with hydrazine reagent to form a formaldehyde hydrazone compound. An aliquot of the resulting solution is analyzed by differential pulse polarography at a dropping mercury electrode. The sample generation system, impinger collection, polarographic analysis, and precision and accuracy data are described. The method was validated over the range of 5.8 to 17.7 mg/cu m, which corresponds to 0.5 to 2 times the (peak) OSHA-PEL for a 30-liter sample at a flow rate of 1 Lpm. The average recovery was 103%. The pooled coefficient of variation or relative standard deviation was 0.08.
已开发出一种极谱法用于测定工作场所空气中的甲醛。样品收集在装有10%甲醇水溶液的小型烧结玻璃泡式吸收管中。吸收液中收集到的甲醛用肼试剂衍生化，形成甲醛腙化合物。取所得溶液的一份等分试样，在滴汞电极上用微分脉冲极谱法进行分析。描述了样品生成系统、冲击式收集、极谱分析以及精密度和准确度数据。该方法在5.8至17.7毫克/立方米的范围内得到验证，这相当于以1升/分钟的流速采集30升样品时职业安全与健康管理局（OSHA）峰值允许暴露极限（PEL）的0.5至2倍。平均回收率为103%。合并变异系数或相对标准偏差为0.08。
