高级搜索

酸性降水中甲醛的测定方法及其稳定性研究

,  , 

downloadPDF

上一篇

下一篇

李孝珍, 白郁华, 王钦军. 酸性降水中甲醛的测定方法及其稳定性研究[J]. 环境化学, 1994, 13(1): 46-52.
引用本文: 李孝珍, 白郁华, 王钦军. 酸性降水中甲醛的测定方法及其稳定性研究[J]. 环境化学, 1994, 13(1): 46-52.
shu
Li Xiaozhen, Bai Yuhua, Wang Qinjun. RESEARCH OF THE STABILITY AND MEASUREMENT METHOD OF FORMALDEHYDE IN ACID PRECIPITATION[J]. Environmental Chemistry, 1994, 13(1): 46-52.
Citation: Li Xiaozhen, Bai Yuhua, Wang Qinjun. RESEARCH OF THE STABILITY AND MEASUREMENT METHOD OF FORMALDEHYDE IN ACID PRECIPITATION[J]. Environmental Chemistry, 1994, 13(1): 46-52.
shu

酸性降水中甲醛的测定方法及其稳定性研究

  • 1.

    北京大学技术物理系, 北京100871

  • 中图分类号: X517

RESEARCH OF THE STABILITY AND MEASUREMENT METHOD OF FORMALDEHYDE IN ACID PRECIPITATION

  • 1.

    Departmsat of Technical Physics, Peking University, Beijing, 100871

  • 摘要: 本文研究了测定酸雨中游离甲醛和络合甲醛总量的方法,在液相中HCHO与S(Ⅳ)络合生成HMSA,通过加入I2丙酮溶液使甲醛游离出,再使用Nash试剂(乙酰丙酮和铵)在60℃水浴中显色30min后在415nm进行光度测定,甲醛总量的检出率≥97%.1992年夏季用该方法测定北京市雨水,其络合甲醛和游离甲醛各占50%左右.测定甲醛总量时,雨样的最佳保护剂是NaHSO3. 测定游离甲醛时,雨样的最佳保护剂是HgCl2和CHCl3.
    Abstract: A new method lor the determination of total formaldehyde[HUHO]T and free formaldehyde[HCHO]F in acid rain was developed. The [HCHO]T including[HCHO]F and adduct HMSA. HCHO was measured by oxidizing bisulfite with iodine to destroy HMSA and reacting [HCHO]F and released HCHO from HMSA with Nash reagent. Acetylacetone ammonium and HCHO condense to form the coloured product diacetyl dihydrolutidine(DDL). It's concentration was determined spectrophotometrically at the maximum of absorption at 415nm wavelength at 60℃(and pH9), the reaction is complete after 30min. Free HCHO was similarly determined in another aliquot but without adding iodine. The difterence between the total and free HCITO measurements gives HMSA content of sample. Recovery of HCHO from the dissociated HMSA was over 97%.This method was applied to the analysis of rainwater collected at Bei jing Zhong Guan Cuen area during the summer of 1992. The results showed that free HCHO and adduct HCHO were amounted to about 50% respectively. NaHSO3 is a perfect protectant of total HCHO in acid rain.
  • 加载中
  • 加载中
WeChat 点击查看大图
计量
  • 文章访问数:  648
  • HTML全文浏览数:  648
  • PDF下载数:  211
  • 施引文献:  0
出版历程
  • 收稿日期:  1992-12-26
李孝珍, 白郁华, 王钦军. 酸性降水中甲醛的测定方法及其稳定性研究[J]. 环境化学, 1994, 13(1): 46-52.
引用本文: 李孝珍, 白郁华, 王钦军. 酸性降水中甲醛的测定方法及其稳定性研究[J]. 环境化学, 1994, 13(1): 46-52.
shu
Li Xiaozhen, Bai Yuhua, Wang Qinjun. RESEARCH OF THE STABILITY AND MEASUREMENT METHOD OF FORMALDEHYDE IN ACID PRECIPITATION[J]. Environmental Chemistry, 1994, 13(1): 46-52.
Citation: Li Xiaozhen, Bai Yuhua, Wang Qinjun. RESEARCH OF THE STABILITY AND MEASUREMENT METHOD OF FORMALDEHYDE IN ACID PRECIPITATION[J]. Environmental Chemistry, 1994, 13(1): 46-52.
shu

酸性降水中甲醛的测定方法及其稳定性研究

  • 1. 北京大学技术物理系, 北京100871
  • 收稿日期:  1992-12-26

摘要: 本文研究了测定酸雨中游离甲醛和络合甲醛总量的方法,在液相中HCHO与S(Ⅳ)络合生成HMSA,通过加入I2丙酮溶液使甲醛游离出,再使用Nash试剂(乙酰丙酮和铵)在60℃水浴中显色30min后在415nm进行光度测定,甲醛总量的检出率≥97%.1992年夏季用该方法测定北京市雨水,其络合甲醛和游离甲醛各占50%左右.测定甲醛总量时,雨样的最佳保护剂是NaHSO3. 测定游离甲醛时,雨样的最佳保护剂是HgCl2和CHCl3.

English Abstract

    全文HTML

参考文献 (0)

返回顶部

目录

/

返回文章
返回

Copyright © 2019 中国科学院生态环境研究中心