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Title: Formaldehyde measurement at a suburban site of north central part of India
Authors: Khare, Puja
Singh, S P
Kumari, K Maharaj
Kumar, Ashok
Srivastava, S S
Issue Date: Oct-2000
Publisher: NISCAIR-CSIR, India
Abstract: Measurement of formaldehyde in rain water, aerosol and vapour phase has been made at Dayalbagh during 1994-1996. The levels of formaldehyde in vapour phase were 1.9 ± 1.2 ppbv at Dayalbagh and showed strong diurnal variation. Levels of formaldehyde were minimum during the night and reaches a maximum between 1000 and 1600 hrs LT. Elevated levels during 1000-1600 hrs LT may be due to increase in in situ production because of high solar irradiation at that time. Formaldehyde showed seasonal variation with higher levels during summer than during winter. The average concentration of aerosol formaldehyde was found to be 0.31±0.3 ppbv. The volume weighted average of formaldehyde in rain water was 3.6 μeq l-1.Regression analysis for rain concentration o f these species vs rain volume and deposition vs rain volume suggests that formaldehyde concentration is not controlled by dilution. However, a continuous supply of formaldehyde is maintained by slowly scavenged materials. The gas phase concentration calculated using Henry's Law Constant and rain water concentration is in good agreement with actual measured concentration.
Page(s): 314-318
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.29(5) [October 2000]

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