Sampling and Analytical Procedure
Agricultural soil samples were collected during February 2010 to April 2011 from the surface layer
(15–20 cm) of soil with a stainless steel Ekman Grab Sampler from twenty (20) different locations
adjacent to DEPZ (Figure 1) in two different seasons—dry and wet season. The sampler was inspected
for possible cross-contamination and cleaned with ambient water for individual sample collection. The
difference from one sampling point to another was approximately 100 m. About 250–300 g of the soil