| 干旱区城市昌吉降雪及积雪中PGEs含量分布及其影响因素 |
| 摘要点击 1825 全文点击 1030 投稿时间：2012-04-10 修订日期：2012-06-19 |
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| 中文关键词 铂族元素 干旱区 中小城市 降雪 积雪 |
| 英文关键词 platinum group metals(PGEs) the arid region small-medium sized cities snowfall snow cover |
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| 中文摘要 |
| 选择干旱区中小城市昌吉市,对其降雪及积雪中铂族元素(PGEs)含量分布及影响因素进行研究.运用ICP-MS对样品进行分析测定.结果表明,降雪中Rh、Pd、Pt平均含量分别为0.43 ng·L-1(未检出~2.24ng·L-1)、60.07 ng·L-1(46.66~84.25 ng·L-1)和4.54 ng·L-1(3.02~6.38 ng·L-1).不同场次降雪中PGEs含量存在差异,随雪前干燥期天数加长,降雪中PGEs含量趋于增大; 降雪量对PGEs含量也有一定影响,降雪量越小,雪中PGEs含量越高.积雪中Rh、Pd、Pt的平均含量分别为6.65 ng·L-1(2.50~18.80 ng·L-1)、83.45 ng·L-1(46.83~199.20 ng·L-1)和8.17 ng·L-1(4.27~13.78 ng·L-1).积雪中PGEs含量远高于降雪,降雪中PGEs仅来自于单场次降雪对大气PGEs的淋洗,而积雪中PGEs不仅来自于多场次降雪中PGEs的累积,且由于积雪长时间暴露,还源源不断接受了大气干沉降带来的PGEs.各采样点积雪PGEs含量表现出交通区＞居民文教区＞公园广场区＞郊区农田,随功能区不同,积雪中PGEs输入途径与输入量有显著差异,这是造成各功能区积雪PGEs含量不同且具有一定规律性的主要原因. |
| 英文摘要 |
| This paper was to select a small-medium sized City, Changji city, over the arid region, study the distribution of platinum group metals(PGEs) contents and influencing factors in snowfall and snow cover. Samples were analysed by ICP-MS.The results revealed that the annual contents of Rh、Pd and Pt in snowfall were on the average value of 0.43 ng·L-1 ranging from not detected to 2.24 ng·L-1, 60.07 ng·L-1 ranging from 46.66 to 84.25 ng·L-1 and 4.54 ng·L-1 ranging from 3.02 ng·L-1 to 6.38 ng·L-1 respectively.The difference of PGEs levels was found in different occurrences of snowfall, tended to increase before snowfall due to the longer arid days. PGEs contents maybe influenced by the amount of snowfall, the less snowfall, the higher PGEs contents reflected. The annual levels of Rh, Pd and Pt in snow cover were in the range of 2.50-18.80 ng·L-1 (av. 6.65 ng·L-1),46.83-199.20 ng·L-1 (av. 83.45 ng·L-1),4.27-13.78 ng·L-1 (av. 8.17 ng·L-1) respectively. PGEs content in snow cover were far higher than that of snowfall, PGEs in snowfall were only obtained from atmospheric PGEs rinsed by single time of snowfall, while PGEs were not only from the accumulation of PGEs in frequent times of snowfall and the snow cover under the long time exposure, but also continuously accepted the PGEs from atmospheric dry deposition. PGEs content of snow cover in all sampling sites were demonstrated as follows: traffic area>residential-culture-education district>square of park>suburban farmland. the input way of PGEs in snow cover was found a remarkable difference with the amount of input within different function areas, which was the main reason caused that PGEs content of snow cover in each function area varied and had a certain regularity. |
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