Phosphorus and iron contents were determined colorimetrically (Dickman & Bray, 1940) from the triple acid-digested samples. HCN was analyzed following procedures outlined in O Brien, Taylor, and Poulter (1991)
Phosphorus and iron contents were determined colorimetrically (Dickman & Bray, 1940) from the triple acid-digested samples. HCN was analyzed following procedures outlined in O Brien, Taylor, and Poulter (1991)