Determination of the chloride ion in rocks and sediments by Mohur’s method قياس ايون الكلور في الصخور والترسبات بواسطة طريقة موهر

Abstract

This study deals with the possibility of determination chloride by the precipitation method instead of turbidity method. The studied method works in the basic media after selecting samples from different rocks and sediments and dissolving them according to the procedure used in our laboratories to dissolve salts in water as sodium sulfate and sodium chloride, determinate the chloride in this method. The dissolution process takes place in one step, which includes the dissolving of the samples with distilled water. Different parameters were studied to obtain the best condition for determining of a chloride in solution resulting from rocks dissolved partially in water. These parameters are included; concentration of silver nitrate as titrant (0.025, 0.05 and 0.10 N), drying temperature (20, 45 and 100 °C), molar ratio of solute to solvent (0.50:250, 1:250 and 5:250), and using different solvents (water or acid). The results found that 5 g amount of sample in 250 mL distilled water, at 20 °C for drying temperature, 30 minutes time of shaking, the normality of titrant (AgNO3) was 0.10 N and the best ratio amount of samples was 5 g that solute in 250 mL of distilled water was the optimum condition to determinate chloride in rocks and sediments.