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Soluble sulfide easily cause corrosion of equipment and pipelines , generating insoluble metal sulfides , leading oilfield produced the increase in the concentration of suspended solids in water , leading to filter pollution , oil and water separation difficulties . Water sulfide corrosion hazard oilfield ground system to keep abreast of trends , rapid determination of the the Oilfield Water sulfides , especially soluble sulfide is extremely necessary . Based on the principle of potentiometric titration using sulfur ion selective electrode method for the determination of the oilfield water soluble sulfide , sulfide corrosion in oilfield water systems endanger trend accurate information , and to take reasonable measures to control sulfide harm . Oilfield water soluble sulfide develop a dedicated testing equipment, to determine the lead nitrate solution as a standard titration reagent , the pH value of not less than 12 in the water sample , and the stirring speed of 800 rpm / min , a single sample analysis time is less than 10min , the oilfield vulcanization was determined that the operation is simple and fast . Complex for oilfield water quality , interference factors , various anions and cations of oilfield water , oil content , mining Pharmacy , suspended solids and other factors interfere with the test , draw at least 10 times the sulfur ion concentration of inorganic anions and cations , oil content suspended solids, polymer and surface active agent on the determination of effects of deviation is less than 5.0%. Insoluble sulfur compounds on the determination of impact , this method only determination of soluble sulfide . Eliminate water samples sulfide oxidation rate to slow down or even short-term , developed sulfide stabilizer formulation , adding sulfide concentrations in water samples of the stabilizer 5h reduced by only 2.3%. Different concentrations of sulfide , with precision of this method relative standard deviation is less than 5.0% , and the recoveries were 93.3 to 106.7% and accuracy test iodometric method with classical methods , the relative deviation of less than 5.0 % and the method detection limit is 0.30mg / L. Proposed method precision, accuracy and detection limit were reached oilfield systems sulfide testing standards . The actual determination of the application of this method and instrument for Oilfield capacity water quality testing , continuous testing instruments run stable oilfield produced water .
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