Risk assessment of heavy2metal pollution in riverside soil of Jiaozuo segment in the Middle Route of South-to-North Water Transfer Project
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Abstract:
Taking Jiao zuo segment in the Middle Ro ute o f South2t o2North Water Transfer Project as the study area, using field in2 vestig ation and experimental analysis, w e collected soil samples from the industrial and mining area, urban area, and ag ricultural ar ea a2 long the main canal, measured the content of heavy metals ( Cr, Ni, Cu, Zn, As, Cd, Hg, and Pb) in the soil, and evaluated the condition of heav y2metal pollution and its potential ecolog ical risks using the single factor po llut ion index, Nemerow pollution index, and Hakanson comprehensive potential eco log ical risk index . The results show ed that, acco rding to the Grade ò criteria of the Standar d for So il Quality ( pH > 71 5) , the main heavy2metal po llution risk element w as Cd. The Nemerow pollutio n index of the ag ricultur al area, ur ban area, and industrial2m ining area was 371 56, 361 65, and 371 98, r espectively, all reaching sev ere po llution level. T he com2 prehensive potential risk index of the three areas was 41 8231 39, 18 9731 18, and 19 6591 09, respectively, all posing hig h ecolog ical risks. The ana lysis r esults show ed that the soil o f the ag ricultur al area, ur ban area, and industria l2mining ar ea along the ma in canal ar e all contaminated by heavy metals to differ ent deg r ees. The industrial2mining area has the most serious po llution, w hich po sed a gr eat threat to the w ater quality safety of the canal. T he abo ve results ar e of important sig nificance to water quality pro2 tectio n and so il po llut ion contro l in the riverside ar ea o f Jiaozuo segment of the South2to2North Water T ransfer Project .
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