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在以乙酸铵为缓冲溶液的介质中,甲醛、铵以及乙酰乙酸甲酯混合反应所生成的有色物质在375 nm波长处有最大吸收。基于这一原理,研究建立了测定空气及水样中微量甲醛的流动注射分光光度法。探讨了最佳的实验条件,在最佳实验条件下,方法的检出限是0.096mg/L,且甲醛标准液在0.12~8.0×10-5mol/L之间符合朗伯比尔定律。对于空气中低浓度的甲醛,建立了活性炭在线富集与流动注射相结合的方法,探讨了不同品牌,不同颗粒度的活性炭的吸附能力。应用本法对实际水样及空气样品进行了测定。
In the medium with ammonium acetate as buffer solution, the color material produced by the reaction of formaldehyde, ammonium and methyl acetoacetate has the maximum absorption at 375 nm. Based on this principle, a flow injection spectrophotometric method for the determination of trace formaldehyde in air and water samples was established. Under the optimal conditions, the detection limit of this method was 0.096 mg / L, and the Lambertil law was obeyed between 0.12 and 8.0 × 10-5mol / L for formaldehyde standard solution. For the low concentration of formaldehyde in the air, a method of on-line enrichment and flow injection of activated carbon was established, and the adsorption capacity of activated carbon with different brands and different particle sizes was discussed. The actual water samples and air samples were measured by this method.