As the pH of soil from BSES was > 7.0 ,diethylenetriaminepentaaacetic acid (DTPA) was used toextr act Cd from soil samples,with as oil tosolution of 1 to 2 an dareaction time of 2 h. The extrac tin gsolution consiste dof 0.005 MDTPA, 0.01 M CaCl2, and 0.01 M
triethanolamine (TEA) adjusted to pH 7.3. This was performed by a
modification of the method of Lindsay and Norvell (1978).