Wet deposition of heavy metals, reactive nitrogen species and dissolved organic carbonat a residential site in Delhi region, India

The deposition of heavy metals on water bodies and soil has adverse consequences on
human health. The elevated Coal-based energy production and increased industrial emissions
have also prompted us to study about heavy metals reactive nitrogen species in the
atmosphere. In the present work, the samples of rain water were collected from a residential
site in south-west Delhi. The samples were analyzed for selected heavy metals by using ICP-
OES. The heavy metals analysis involved voltammetry method using 797 VA Computrace
(Metrohm, Switzerland) instrument. The analysis of Total Nitrogen (TN) and dissolved
organic carbon (DOC) was carried out by using chemiluminescence based TN/TOC analyzer
(Shimadzu model TOC-LCPH E200 ROHS). The mean values of Cu, Mn, Zn, Al, As and Hg
were calculated as 34.5 mg/l, 19.5 mg/l, 52.7 mg/l, 392.3 mg/l, 9.8 mg/l and 1.6 mg/l
respectively. The mean values for TN and DOC were 12.7mg/l and 2.8 mg/l respectively. The
detailed results will be discussed in the EGU General Assembly Meeting.

Keywords: Total Nitrogen, wet deposition, ICP-OES, voltammetry, agricultural area.