An investigation of acid precipitation in Qinghai province, China
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Abstract
Precipitation and surface water samples from the Tibetan Plateau in Qinghai Province, China. were collected in June 1981, in both remote and settled areas on the plateau. A pH measurement in one urban precipitation sample indicated extremely acidic precipitation, with a pH of 2.25. In the remote Amne Machin mountains, precipitation pH's did not vary significantly from a value of approximately 6, but levels of certain ions were unexpectedly high. In all samples for which major anions were measured, including the very acidic urban sample, nitrate concentrations exceeded sulfate concentrations by a wide margin, despite the dominance of coal burning in the region.