Variation of Stable Carbon and Nitrogen Isotopic Composition of PM10 at Urban Sites of Indo Gangetic Plain (IGP) of India

摘要

This paper presents the variation of elemental concentrations of total carbon (TC), total nitrogen (TN) and isotopic ratios of delta C-13 and delta N-15 along with delta(OC)-O-13 and OC of PM10 mass over Delhi, Varanasi and Kolkata of the Indo Gangetic Plain (IGP), India. For Delhi, the average concentrations of TC and TN of PM10 were 53.0 +/- A 33.6 and 14.9 +/- A 10.8 A mu g m(-3), whereas delta C-13 and delta N-15 of PM10 were -25.5 +/- A 0.5 and 9.6 +/- A 2.8 aEuro degrees, respectively. For Varanasi, the average values of delta C-13 and delta N-15 of PM10 were -25.4 +/- A 0.8 and 6.8 +/- A 2.4 aEuro degrees, respectively. For Kolkata, TC and TN values for PM10 ranged from 9.1-98.2 to 1.4-25.9 A mu g m(-3), respectively with average values of 32.6 +/- A 24.9 and 9.3 +/- A 8.2 A mu g m(-3), respectively. The average concentrations of delta C-13 and delta N-15 were -26.0 +/- A 0.4 and 7.4 +/- A 2.7 aEuro degrees, respectively over Kolkata with ranges of -26.6 to -24.9 aEuro degrees and 2.8 +/- A 11.5 aEuro degrees, respectively. The isotopic analysis revealed that biomass burning, vehicular emission and secondary inorganic aerosols were likely sources of PM10 mass over IGP, India.