Relationship between the extractable metals from soils and metals taken up by maize roots and shoots.
Two extraction procedures, i.e. a single extraction procedure using low-molecular-weight-organic-acids (LMWOAs) as extractant and a sequential extraction procedure recommended by the European Community Bureau of Reference (BCR), were performed to extract metal fractions from wet rhizosphere soil. And the extracted soil solutions were further fractionated as colloidal and truly dissolved fractions. Heavy metals in maize roots were experimentally defined as metals adsorbed on cell wall and metals taken up by cross-membrane by washing with CaCl(2). The correlation coefficients between extractable metals from soil and taken up by maize roots and shoots were compared between two extraction methods, and a good correlation was obtained if LMWOAs were used. In contrast, the correlation coefficients were poor when the BCR method was used.
Wang
Wei Sheng
WS
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085 Beijing, China.
Shan
Xiao Quan
XQ
Wen
Bei
B
Zhang
Shu Zhen
SZ
D002264:Carboxylic Acids; D019216:Metals, Heavy / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry; D018520:Plant Shoots / Q000737:chemistry; D012987:Soil / Q000032:analysis*; D003313:Zea mays / Q000737:chemistry*
D002264:Carboxylic Acids; D019216:Metals, Heavy; D012987:Soil