As th e p H of s oi l fr om B SE S w a s > 7. 0 , d ie t h yl en et ri a m i n ep e n t a a a c e t i c a c i d ( D T P A ) w a s u s e d t o e x t r a c t C d f r o m s o i l s a m p l e s ,
wi th a s oi l t o s ol u ti on o f 1 t o 2 a n d a r e a c t io n ti m e o f 2 h .