PJB-2019-917
Association of arsenic fractions to arsenic in rice plants
Muhammad Chohan, Mehrunisa Memon, Inayatullah Rajpar and Muhammad Saleem Akhtar
Abstract
Arsenic in rice fields of district Tando Mohammad Khan is a concern, most likely originating from long term canal irrigation water receiving significant quantities of wastewater. Evaluation of available soil arsenic through fractionation schemes can help understand the chemical association with elements and its transformation to rice. In this study 120 soil samples, from 24 rice fields and associated rice shoots were collected from intensive rice cultivated area of the district. Fractionation schemes illustrated that most of the arsenic in soils was calcium-bound and available arsenic (water soluble + exchangeable), with some as iron and aluminum bound arsenic, contributing 38, 29, 17 and 10 percent to total soil arsenic. The regression equations further confirmed the significant contribution of each calcium-bound (r = 75), available (r = 65), iron-bound (r = 49) and aluminum-bound arsenic (r = 0.42) to rice grain. The same was true for straw + husk, however, the relationships were significant only in case of calcium-bound (r = 0.79) and available arsenic (0.48). Only 4 out of 24 sites were contaminated by soil arsenic (5.47-59.77 mg kg-1) and 01 by grain arsenic (0.15-1.00 mg kg-1), but concentration in straw + husk was more (0.30-1.29 mg kg-1) than that in grain. In order to avoid further arsenic increase in rice soils, regular monitoring of arsenic in soil, rice grain and straw + husk may be carried out
To Cite this article:
Chohan, M., M. Memon, I. Rajpar and M.S. Akhtar. 2020. Association of arsenic fractions to arsenic in rice plants. Pak. J. Bot., 52(6): DOI: http://dx.doi.org/10.30848/PJB2020-6(15)
Download
