Standard method for hygienic examination of sulfur dioxide in air of residential areas -Formaldehyde solution sampling -pararosaniline hydrocloride spectrophotometric method.
Standard method for hygienic examination of sulfur dioxide in air of residential areas -Formaldehyde solution sampling -pararosaniline hydrocloride spectrophotometric method.
居住区大气中二氧化硫卫生检验标准方法甲醛溶液吸收-盐酸副玫瑰苯胺分光光度法.