兰州城区某地自然降尘特性及其变化规律

Characteristics and variations of fall-dust in the Lanzhou urban district

用仪器中子活化法分析了１９９３年９月至１９９４年８月间兰州城区自然降尘中３２种元素的浓度，用离子色谱法测定了７种水溶性阴离子的浓度，计算了元素的富集因子。初步探明了降尘的化学组成及其中元素、水溶性离子的分布和变化规律。

Thirty two elements and seven water-soluble anions in fall dust samples at the Lanzhou urban district during September 1993 to August 1994 were determined by instrumental neutron activation analysis(INAA) and ion chromatography(IC), respectively The enrichment factors(EF) of the elements were also calculated, and the chemical compositions, distributions and seasonal variations of all the elements and anions in the fall dust were preliminarily studied