Carbonyls in the metropolitan area of Mexico city:: Calculation of the total photolytic rate constants Kp(S-1) and photolytic lifetime (τ) of ambient formaldehyde and acetaldehyde

被引：3

作者：

Báez, AP ^{[1
]}

Torres, MDB ^{[1
]}

García, RM ^{[1
]}

Padilla, HG ^{[1
]}

机构：

[1] Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Lab Quim Atmosferica, Mexico City 04510, DF, Mexico

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2002年 / 9卷 / 04期

关键词：

acetaldehyde; ambient aldehyde measurements; calculation of photolytic rate constants; carbonyls; formaldehyde; Mexico City; photolytic lifetime;

D O I：

10.1007/BF02987496

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A great number of studies on the ambient levels of formaldehyde and other carbonyls in the urban rural and maritime atmospheres have been published because of their chemical and toxicological characteristics, and adverse health effects. Due to their toxicological effects, it was considered necessary to measure these compounds at different sites in the metropolitan area of Mexico City, and to calculate the total rate of photolytic constants and the photolytic lifetime of formaldehyde and acetaldehyde. Four sites were chosen. Sampling was carried out at different seasons and atmospheric conditions. The results indicated that formaldehyde was the most abundant carbonyl, followed by acetone and acetaldehyde. Data sets obtained from the 4 sites were chosen to calculate the total rate of photolysis and the photolytic lifetime for formaldehyde and acetaldehyde. Maximum photolytic rate values were obtained at the maximum actinic fluxes, as was to be expected.

引用

页码：230 / 233

页数：4

共 14 条

[1] PRODUCTION OF ALDEHYDES AS PRIMARY EMISSIONS AND FROM SECONDARY ATMOSPHERIC REACTIONS OF ALKENES AND ALKANES DURING THE NIGHT AND EARLY MORNING HOURS [J].

ALTSHULLER, AP .

ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS, 1993, 27 (01) :21-32

[2]

ATKINSON R, 1999, J PHYS CHEM REF DATA, V28, P366

[3]

Báez AP, 2000, ATMOSFERA, V13, P121

[4] MEASUREMENTS OF FORMALDEHYDE AND ACETALDEHYDE IN THE ATMOSPHERE OF MEXICO-CITY [J].

BAEZ, AP ;

BELMONT, R ;

PADILLA, H .

ENVIRONMENTAL POLLUTION, 1995, 89 (02) :163-167

[5]

Demerjian K.L., 1980, ADV ENV SCI TECHNOL, V10, P369

[6]

FEINMAN SE, 1983, FORMALDEHYDE SENSIVI, P167

[7] PHOTOCHEMISTRY OF POLLUTED TROPOSPHERE [J].

FINLAYSON, BJ ;

PITTS, JN .

SCIENCE, 1976, 192 (4235) :111-119

[8]

FINLAYSONPITTS JB, 1986, ATMOSPHERIC CHEM FUN, P108

[9]

GRASFTROM RC, 1990, MUTAT RES, V238, P175

[10] URBAN AIR-POLLUTION IN BRAZIL - ACETALDEHYDE AND OTHER CARBONYLS [J].

GROSJEAN, D ;

MIGUEL, AH ;

TAVARES, TM .

ATMOSPHERIC ENVIRONMENT PART B-URBAN ATMOSPHERE, 1990, 24 (01) :101-106

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