Electrolytic cell for microcoulometric determination of total sulfur content

Abstract

The invention relates to an electrolytic tank for determining the total content of sulphur by adopting a microcoulometric method. The electrolytic tank comprises a center chamber, wherein the center chamber is internally provided with a measurement electrode and an electrolusis electrode, the eliectrolytic tank is further provided with a reference chamber and a cathode chamber, a position close to the bottom of the center chamber is respectively connected with the reference chamber and the cathode chamber through communicating channels, the reference chamber is provided with a reference electrode, the reference electrode is internally filled with saturated iodine water, is provided with platinum filaments extending into the saturated iodine water from the top of the reference electrode, and the bottom of the reference electrode is provided with a porous ceramic core. The electrolytic tank can be used for determining the total content of the sulphur in various petroleum products or various organic liquid chemical products by adopting the microcoulometric method, and has the advantages of high analysis speed, stable base line, no negative peak, no base line drifting, good detection repeatability, high accuracy of detection results, low detection lower limit and low detection limit.

Description

technical field [0001] The invention belongs to the technical field of analytical instruments, and relates to a new type of electrolytic cell for the determination of total sulfur content by microcoulometry, especially suitable for the determination of total sulfur content in petroleum products, and can also be used for the microcoulometry of trace amounts of sulfur in other organic chemical products Determination. Background technique [0002] Petroleum products such as gasoline and diesel have played a huge and irreplaceable role in the national economy and people's daily life. Sulfur is the most important harmful component in petroleum products. It mainly exists in petroleum products in the form of elemental sulfur, sulfide, and sulfate. The sulfur contained in petroleum products will generate harmful SO after combustion. 2 , SO 3 Gas and fly ash are discharged into the atmosphere along with exhaust gas, which is one of the main culprits causing PM2.5 pollution and acid...

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Problems solved by technology

The electrolytic cell with the double-capillary design has very high requirements on the process during firing, and the firing consistency of the capillary is difficult to control. If the capillary is too large, it is easy to leak iodine, so that the iodine particles in the reference chamber 1 pass through the capillary. The hole seeps into the reference arm 2, and then penetrates into the central chamber 3 through the capillary between the reference arm 2 and the central chamber 3, which causes the baseline of the microcoulomb sulfur content analyzer to drift downward, making the test impossible; the capillary If it is too small, it is easy to cause the ion exchange in the reference electrode 4 and the central chamber 3 to be too slow, thereby causing the peak shape tailing of the microcoulomb sulfur content analyzer and affecting the accuracy of the detection results; The volume is too small, and only about 10ml of electrolyte can be used to measure the sulfur content each time. Generally, the detection is carried out for about 4 hours at most, and the electrolytic cell needs to be flushed again, and the electrolyte in the electrolytic cell should be replaced, which will significantly Increase the cumbersomeness of operation and affect the work efficiency of analysts; moreover, its complex structure and high difficulty of firing make the cost high and cannot significantly reduce production costs

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