2003 Volume 13 Issue 1 Pages 143-153
Daily variations of organochlorine pesticides in ambient air were investigated at a rural site of Niigata City. Target compounds are 10 kinds of organochlorine pesticides, hexachlorobenzene (HCB), α-, β-, γ - and δ-hexachlorocyclohexanes (HCH), trans-and cis-chlordanes, p, p'-DDE, p, p'-DDE and p, p'-DDT. HCB and α -HCH showed high values and low deviations in concentration in these compounds. On the contrary, δ-HCH and p, p'-DDD were rarely detected. Relationship between meteorological parameters (temperature, wind direction, wind speed and rainfall) and the concentrations of eight compounds, which were usually detected, was examined. Concentrations of HCB, β-HCH, trans- and cis-chlordanes were correlated negatively with wind speed, and it was suggested that these compounds would have sources around the sampling point. Concentration of β-HCH was also correlated with amount of rainfall. Concentrations of p, p'-DDE and p, p'-DDT increased when air masses mainly came from the south west and decreased when air masses came from the north or the west, which suggested the existence of sources in the direction of the south west.
