Concentration and Enrichment Characteristics of Elements in PM_(10) of Tianjin

To understand concentration levels and source of elements in PM10,samples were collected in seven different sampling stations and concentration of 19 elements was observed in Tianjin.Results indicated that Ni,Pb,Cu and Cr were main pollutants in PM10,while elements such as K,Ca,Na,Mg,Al,Si,Fe and Ti were main contributors,with contribution rate of 92%.The enrichment factors of 19 elements were obviously lower in windy season than in nonheating season.Five elements including Co,Cu,Zn,Br and Pb with enrichment factors over 10 were affected by human activities and the important elements for pollution control.