Influence of physical and chemical properties of solids on heavy metal adsorption

摘要: Partition of heavy metals between particulate and dissolve fraction stormwater primarily depends on the adsorption characteristics solids particles. Moreover, bioavailability is also influenced by behaviour solids. However, due to lack fundamental knowledge in relation processes road deposited solids, effectiveness management strategies can be limited. The research study focused investigation physical chemical parameters urban surfaces and, more specifically, metal Due complex nature interaction with a substantial database was generated through series field investigations laboratory experiments. sites for build-up pollutant sample collection were selected from four urbanised suburbs located major river catchment. Sixteen these represented typical industrial, commercial residential land uses. Build-up pollutants collected using wet dry vacuum technique which specially designed improve fine particle collection. Roadside soil samples each suburb comparison surface separated into size ranges tested range parameters. contained high (70%) particles smaller than 150im, are favourable adsorption. These predominantly consist derived minerals included quartz, albite, microcline, muscovite chlorite. Additionally, percentage amorphous content identified In comparing mineralogical data surrounding it found that about 30% consisted traffic related activities surfaces. Significant difference composition noted different sizes Fine ( 150im) sandy matrix at all sites, 60% quartz content. differences components, larger 150im had significant their specific area (SSA) effective cation exchange capacity (ECEC). parameters, turn, exert influence Consequently, >150im lower case <75im highest content, corresponding its clay forming minerals, organic matter low increased SSA, ECEC presence Fe, Al Mn oxides. oxides create distinct groups charge exhibit mechanisms bond strength, elements sites. Therefore, predominance factors leads characteristics. Heavy show preference association particles, whilst coarse preferentially associate matter. Although material very low, embedded materials have potential impact quality.Adsorption not confined an individual type site whereas several types This attributed dearth preferred binding inability reach competition species. confirms significantly lead heterogeneity highlighted importance removal runoff before they enter receiving waters reduce risk posed metals. only results easily mobile bound but occur as result dissolution other forms bonds changes or microbial activity. diversity amount surfaces, bulk adequate gain understanding recommended enhancing quality practices.