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Titolo:
Instances of soil and crop heavy metal contamination in China
Autore:
Wang, QYD; Cui, Y; Liu, X;
Indirizzi:
Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R ChinaChinese Acad Sci Beijing Peoples R China 100085 100085, Peoples R China Shandong Agr Univ, Coll Land Resource & Environm Sci, Tainan 271018, Taiwan Shandong Agr Univ Tainan Taiwan 271018 vironm Sci, Tainan 271018, Taiwan
Titolo Testata:
SOIL & SEDIMENT CONTAMINATION
fascicolo: 5, volume: 10, anno: 2001,
pagine: 497 - 510
SICI:
1532-0383(2001)10:5<497:IOSACH>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
THLASPI-CAERULESCENS; PHYTOREMEDIATION; PLANTS; ZINC;
Keywords:
As; Cd; Cr; Hg; Pb; soil; crop; contamination;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, QYD Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd,POB 2871, Beijing 100085, Peoples R China Chinese Acad Sci 18 Shuangqing Rd,POB2871 Beijing Peoples R China 100085
Citazione:
Q.Y.D. Wang et al., "Instances of soil and crop heavy metal contamination in China", SOIL SEDIM, 10(5), 2001, pp. 497-510

Abstract

Both general and specific investigations of soil and crop heavy metal contamination were carried out across China. The former was focused mainly on Cd, Hg, As, Pb, and Cr in soils and vegetables in suburbs of four large cities; the latter investigated Cd levels in both soils and rice or wheat in contaminated areas throughout 15 provinces of the country. The results indicated that levels of Cd, Hg, and Pb in soils and some in crops were greater than the Governmental Standards (Chinese government limits for soil and cropheavy metal contents). Soil Cd ranged from 0.46 to 1.04 mg kg(-1), on average, in the four cities and was as high as 145 mg kg(-1) in soil and 7 mg kg(-1) in rice in the wide area of the country. Among different species, tuberous vegetables seemed to accumulate a largerportion of heavy metals than leafy and fruit vegetables, except celery. For both rice and wheat, two staple food crops, the latter seemed to hav muchhigher concentrations of Cd and Pb than the former grown in the same area. Furthermore, the endosperm of both wheat and rice crops had the highest portion of Cd and Cr. Rice endosperm and wheat chaff accumulated the highest Pb, although the concentrations of all three metals were variable in different parts of the grains. For example, 8.3, 6.9, 1.4, and 0.6 mg kg(-1) of Pb were found in chaff, cortex, embryo, and endosperm of wheat compared with0.11, 0.65, 0.71, and 0.19 mg kg(-1) in the same parts of rice, respectively. Untreated sewage water irrigation was the major cause of increasing soil and crop metals. Short periods of the sewage water irrigation increased individual metals in soils by 2 to 80% and increased metals in crops by 14 to 209%. Atmospheric deposition, industrial or municipal wastes, sewage sludge improperly used as fertilizers, and metal-containing phosphate fertilizers played an important role as well in some specific areas.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 22:53:59