All soil samples were then air-dried and passed through a 2-mm sieve. Total Cd concentration was determined using concentrated HCl and HNO3, and the samples were analyzed by an atomic absorption spectrophotometer.
All soil samples were then air-dried and passed through a 2-mm sieve. Total Cd concentration was determined usingconcentrated HCl and HNO3, and the samples were analyzed by an atomic absorption spectrophotometer.