A Model for the Relationship between Boron, Fluoride and Salinity of Groundwater at Safwan. S. 1raq.

Abstract

The variability of boron concentration in soil and groundwater mostly depends upon the farm life and clay sediment prevailing. The old farm reflect that the boron is mostly leached out from soil and concentrated in groundwater. It is also found that for the given boron concentration in soil of individual locations, the groundwater is of variable boron content. In term of average, the relation is more active in two directions. The groundwater salinity in term of electrical conductivity EC controls the positive condition of the proportionality. The standard model is 3^rd order polynomial regression. This model verifies the condition of EC ? 6 ds/m and EC ? 7.3- 8.5 ds/m. The segment between 6 ds/m and 7.3 ds/m is a liner relationship.  Fluoride concentration in groundwater is variable as that of the boron in the time and location. Under the condition of that B < 0.4 mg/l, Fluoride will never exceed. Also there are two types of boron-fluoride function BFF according to boron concentration. If the boron concentration 0.4 ? B ? 1.0 mg/l, The BFF will reflect that F is less than B in concentration F? 0.5B, and also shows that F > B in concentration if and only if 1 < B < 3.1. Two filters were used for building the BFF according to boron concentration: The final model is constructed by Basic computer program. It includes three variables electrical conductivity, boron and fluoride.

Key words: Boron; Fluoride; Groundwater; Model; Salinity