Method for Determination of Active Substances in Daqing Oilfield Petroleum Sulfonate Samples by Liquid Chromatography
A petroleum sulfonate and liquid chromatography technology, which is applied in the field of quality analysis and monitoring of chemical flooding surfactants in oilfields, can solve the problems of large amount of solvent, certain deviation, long analysis time, etc., and achieves stable detection performance and small quantitative error. , the effect of fast analysis
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Embodiment 1
[0050] (1) Preparation of standard solution: prepare standard solutions of sodium dodecylbenzenesulfonate and sodium 2-naphthalenesulfonate with a concentration of 500 mg / L in distilled water, and then mix them according to the weight ratio of 4.5:5.5 to obtain a concentration of 500 mg / L mg / L sodium dodecylbenzenesulfonate / sodium 2-naphthalenesulfonate mixed solution, as mother liquor. Dilute sequentially to prepare a series of solutions with concentrations of 400 mg / L, 300 mg / L, 200 mg / L, 100 mg / L, and 50 mg / L, respectively, as standard solutions for quantification.
[0051] (2) Draw a quantitative working curve: the chromatographic analysis conditions are as follows: mobile phase A 90% methanol, B 90% methanol (containing 0.2M acetic acid and 0.2M ammonium acetate), gradient elution, the gradient condition is 0~1min, 100 %A, 1.01min, 80%B, 1.01~3min, 80%B; flow rate 1.0mL / min; UV detector, detection wavelength 254nm; injection volume 20µL. Chromatographic analysis is perfo...
Embodiment 2
[0058] Except that the petroleum sulfonate sample to be tested (batch 2) was different, the rest of the steps were the same as in Example 1. Chromatography and extraction methods were used to test the content of active matter in the petroleum sulfonate sample, and the results are shown in Table 1.
Embodiment 3
[0060] Except that the petroleum sulfonate sample to be tested (batch 3) was different, the rest of the steps were the same as in Example 1. Chromatography and extraction methods were used to test the content of active matter in the petroleum sulfonate sample, and the results are shown in Table 1.
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