Device and method for detecting long-light-path liquid sulfide

Abstract

The invention relates to a device for detecting long-light-path liquid sulfide. A rheostat is connected between a power supply and a light source; a light-preventing shell is arranged on an emergent light path of the light source; a reaction vessel is arranged in the light-preventing shell, and a dosing tube is arranged on the top of the light-preventing shell; a breathable film tube is arranged in the reaction vessel along the radial direction; the breathable film tube is connected with an incident optical fiber through a liquid inlet pipe and is connected with an emergent optical fiber through a liquid outlet pipe; the incident optical fiber is connected with the light source; the emergent optical fiber is connected with a photoelectric converter; the photoelectric converter is connected with a data acquisition unit; the data acquisition unit is connected with a computer. The sulfide overflows from a matrix to be detected by using an acid dosing method, an interference phenomenon of foreign ions existing in the complex pretreatment process is avoided, the measurement selectivity is improved, the pretreatment is not required, the measurement process is simplified, and interference of external light is avoided due to reaction under light-resistant conditions, so that the measurement process is not interfered by impurities, and the analysis efficiency and the detection sensitivity are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis instruments, in particular to a simple, sensitive and rapid detection device and method for determining sulfide in liquid. Background technique [0002] Sulfides refer to soluble inorganic sulfides (including H 2 S, HS ‐ and S 2‐ ) and acid-soluble metal sulfides, which are the second category of pollutants identified by the State Environmental Protection Administration. There are three main forms of sulfide in solution: H 2 S, HS ‐ , S 2‐ , when acid is added, the HS in it ‐ , S 2‐ converted to H 2 S, when the concentration of dissolved hydrogen sulfide is greater than its solubility, hydrogen sulfide will overflow from the solution. [0003] Sulfides widely exist in aqueous solutions such as oil fields, coal mines and smelters. The sulfide in the solution is easily converted into hydrogen sulfide when the pH decreases and overflows from the solution, which brings a lot of inc...

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Problems solved by technology

[0005] During the experiment, the inventor found that the pretreatment of the above two methods is relatively complicated, the measurement process is relatively time-consuming, and the optical path of the ultraviolet-visible spectrophotometer is relatively short. Among all the molecules participating in the reaction, only those involved in light absorption A small fraction, less sensitive

For the determination of sulfide, in addition to the above methods, there are fluorescence method, sensitive sulfur electrode method, polarographic method, lead acetate reaction rate method, etc., but most of the instruments used in these methods are relatively expensive, and the operation is complicated and inconvenient to carry.

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