A photometric method for determining formaldehyde in the air using phenol-formaldehyde resins

Photometric procedure of methanol determination based on its reaction with phenyl hydrazin and dinitride sulfanilic acid was developed. The procedure was highly sensitive (0.1 microgram in the analyzed volume) and selective in the presence of phenol, furyl alcohol, methanol and furfurol.     

管式个体采样器测定空气中甲醛的研究

目的:研制测定空气中甲醛的被动式个体采样器。方法:根据费克第一扩散定律设计新型被动式个体采样器,并对采样器的性能指标进行评价。结果:在温度10℃~40℃,湿度20%~40%,风速50~600 cm/s的范围内,被动式采样器测定空气中甲醛采样流量:104.05 ml/min,最大吸附容量0.2751 mg,最短采样时间为30 min,用前稳定性≥30 d,样品稳定性≥14 d,精密度RSD为5.34%。结论:研制的个体采样器可以作为一种测定空气中甲醛的新型采样仪器。