An experimental device for continuously extracting various forms of sulfur in sediment samples

Abstract

The invention discloses an experimental apparatus for continuous extraction of various forms of sulfur in a sediment sample. The apparatus comprises four units. A sample reaction and extraction unit comprises a reaction vessel, a condenser pipe and a magnetic stirrer; and the reaction vessel is placed on the magnetic stirrer. A reaction reagent addition and preparation unit includes a chromatography column, a cylindrical separating funnel and a three-way selector valve; the chromatography column is used to prepare a chromium chloride solution and add the chromium chloride solution to the reaction vessel; the cylindrical separating funnel is used for adding acid to the reaction vessel; and the three-way selector valve switches to add different solutions. A nitrogen air passage unit comprises a nitrogen bottle, a pressure reducing valve and gas flow meters; the nitrogen gas is connected to the two gas flow meters by pipes; and one gas flow meter is connected with a gas inlet on the upper end of the chromatography column, and the other gas flow meter is communicated with a gas inlet on the reaction vessel. A gas absorption unit is a gas absorption tube. The apparatus has the advantages of simple structure, good air tightness, high extraction efficiency, and easy and fast operation, and can effectively and continuously extract six forms of sulfur in one sediment sample.

Description

technical field [0001] The invention relates to an experimental device for continuously extracting various forms of sulfur in sediment samples, which is used as a sample pretreatment technology and device for the analysis of the content of various forms of sulfur in sediments and its stable isotope, and is mainly used for the analysis of sulfur The field of geochemical cycle and geological history evolution process research. technical background [0002] In nature, sulfur exists in various valence states and forms, and is prone to redox reactions. It is one of the main elements controlling the redox system in sediments, and usually participates in important diagenetic processes such as exchange, adsorption, redox, and precipitation. Therefore, the research on the geochemical cycle of sulfur and the evolution process of geological history has attracted the attention of scholars. With the continuous deepening of the research on the geochemical cycle of sulfur, it is not enoug...

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Problems solved by technology

Therefore, research on various forms of sulfur in sediments has attracted increasing attention, but there is no systematic report on the complete process of fractional and continuous extraction of sulfur forms, mainly inorganic sulfur: namely acid volatile sulfur, elemental sulfur and yellow iron Mineral sulfur is the main method, and the extraction methods generally adopt cold diffusion method and hot distillation method. It takes 24 hours to extract one form of a sample by cold diffusion method, while the extraction speed of hot distillation method is faster, but these methods that have been reported are mainly aimed at Extraction of a single form, and usually a single-necked flask or a three-necked flask is used as the reaction vessel for extraction. After the extraction process of a certain form is completed, the extractant and the sediment are not easy to separate, that is, it is difficult to continuously extract the second and third sulfur forms.

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