【摘要】 青藏高原东部多年冻土区内大气降水中氚含量为185—14T.u,地表水为183—20T.u,冻结层上水为107—59T.u,冻结层下水为39-7T.u,构造融区深层水和温泉水为37—20T.u,各类地下冰为122—7T.u。 氚含量值具有东南部低、西部和北部高的地带性规律。利用不同类型水中氚值差异可确定各类地下水补给年代和循环周期及地下冰的水分来源。 研究表明本区自80年代以来,大气降水、地表水和地下水的氚浓度在逐渐下降。更多还原

【Abstract】 Three types of houses in Beijing were investigated that a smoking household and non-smoking one in each type were compared. Inhalable particulate (IP), respira-ble particulate (RP) and carbon monoxide (CO) were monitored in the living rooms and kitchens respectively for four seasons. At the same time carboxyhaemoglobin (COHb) was measured individually for each of the householders. The results showed that indoor air pollution was rather serious, especially in winter when particulate concentration was even as high as 47ppm. Indoor air pollution is closely related to types of houses, particularly to the ways of heating. Air pollution will be greatly decreased when central heating facilities are established.The analysis of 30 elements showed that the pollution was typically derived from coal burning and aggravated by dust wind, but indoor higher Pb level was probably due to use of liquified petroleum gas for cooking. In our study, the effect of cigarette smoking seemed to be covered up by the serious indoor air pollution.更多还原