Abstract
An investigation was carried out to assess the extent of ionic toxicity of surface water samples for agricultural usage in the Karatoya-Bangali Floodplain (2,577 sq. km). Fifteen water samples were collected from five industrial areas of Bogura sadar upazila to assess the dissolved chemical constituents and also to classify them on the basis of their comparative stability for agricultural usage. Water samples were collected from surface water sources viz., rivers, canals and ponds at Bogura sadar upazila. The chemical analyses included pH, electrical conductivity (EC), total dissolved solids (TDS), Ca, Mg, K, Na, Zn, Cu, Fe, Mn, Cd, Pb, B, As, CO3, HCO3, PO4, SO4 and Cl. The pH indicated that surface water samples were acidic to alkaline in nature (pH = 6.5-8.8). The electrical conductivity (EC) and sodium absorption ratio (SAR) revealed that all the surface samples were categorized as ‘medium salinity’ and ‘low alkalinity’ hazards with ‘excellent’ and ‘good’ in quality combining expressed as C2S1. Considering TDS all the surface waters were as ‘freshwater’. Soluble sodium percentage (SSP) indicated that all the surface water samples were ‘excellent’ and ‘good’ classes. Residual sodium carbonate (RSC) categorized the surface water samples as ‘suitable’ in quality for irrigation. The status of Ca, Mg, Na, K, Zn, Cu, As, B, Fe, CO3, SO4, PO4, and Cl were not hazards in the investigated area. In all surface water samples, HCO3 ion was considered as pollutant for irrigating crops. Rest ionic constituents were suitable for irrigation purposes. As, B, SO4, Cl and TDS were not problematic for drinking, TDS, Cd, Cu and Zn were not hazardous for livestock usage and SO4 and hardness (HT) were not problematic for aquaculture. But rest ionic constituents for these respective usages were toxic.
 Res. Agric., Livest. Fish.6(2): 227-234, August 2019
Highlights
Toxicity can be termed as a degree to which a substance can damage an organism
15 surface water samples were randomly collected to cover most of the study areas during 6 September 2013 to 8 September 2013 following the instructions as outline by Hunt and Wilson (1986) and APHA (2005).Out of 15 surface water samples, 5 water samples were collected from Karatoa river, 5 water samples were collected from sewages and 5 water samples were collected from ponds
Water quality rating or toxicity for irrigation usage The pH value of surface water samples ranged from 6.5 to 8.8 reflecting acidic to alkaline in nature
Summary
Toxicity can be termed as a degree to which a substance can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a substructure of the organism, such as a cell or an organ such as the liver. Heavy metals contamination in river is one of the major quality issues in many fast growing cities, because maintenance of water quality and sanitation infrastructure did not increase along with population and urbanization growth especially for the developing countries (Karbassi et al 2007; Akoto et al 2008; Ahmad et al 2010). Some of these are carcinogenic at high concentrations and can cause serious health hazard if they enter into the food chain. Investigations have been made in different countries by different researchers on the extent of heavy metals pollution in surface water, ground water, soil, sediments and vegetation (Zakir et al, 2006; Mohiuddin et al, 2010; Akbal et al, 2011; Zakir et al, 2011; Shikazono et al, 2012)
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