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

A detection device and sulfide technology, which are applied in the research field of chemical analysis instruments, can solve the problems of time-consuming measurement process, complicated pretreatment, inconvenient portability, etc., to avoid interference of external light, simplify the measurement process, and have a lightweight device structure. Effect

Inactive Publication Date: 2014-08-13
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

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Experimental program
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Embodiment 2

[0047] The air-permeable membrane tube 9 in the long optical path liquid sulfide detection device of this embodiment is made of polytetrafluoroethylene material, its length is 2 cm, and its cross-sectional diameter is 0.2 cm, that is, the ratio of cross-sectional diameter to length is 1:10. Other components and their connections are the same as those in Embodiment 1.

[0048] The method for detecting with the above-mentioned long optical path liquid sulfide detection device is composed of the following steps:

[0049] (1) Add 0.5mL ultrapure water to the reaction vessel 7 as a blank solution, close the drain control valve 16, open the liquid inlet control valve 15, and add 0.0628mL to the gas-permeable membrane tube 9 with a pH of 12 and a concentration of 0.10mol / L The sodium nitroprusside absorption liquid is coupled and conducted through the incident optical fiber 4, and the green light with a wavelength of 535nm is passed from the liquid inlet end of the absorption liquid ...

Embodiment 3

[0055] In the liquid sulfide detection device with long optical path in this embodiment, the gas-permeable membrane tube 9 is made of polytetrafluoroethylene material, its length is 10 cm, and its cross-sectional diameter is 0.2 cm, that is, the ratio of cross-sectional diameter to length is 1:50. Other components and their connections are the same as those in Embodiment 1.

[0056] The method for detecting with the above-mentioned long optical path liquid sulfide detection device is composed of the following steps:

[0057] (1) Add 0.5mL ultrapure water to the reaction vessel 7 as a blank solution, close the drain control valve 16, open the liquid inlet control valve 15, and add 0.314mL to the gas-permeable membrane tube 9 with a pH of 12 and a concentration of 0.01mol / L The sodium nitroprusside absorption liquid is coupled and conducted through the incident optical fiber 4, and the green light with a wavelength of 535nm is passed from the liquid inlet end of the absorption l...

Embodiment 4

[0063] In the detection method of the long optical path liquid sulfide in the above-mentioned embodiments 1-3, step (1) is to add 0.1mL ultrapure water to the reaction vessel 7 as a blank solution, and add 0.2mL to the gas-permeable membrane tube 9 with a pH of 13 , the sodium nitroprusside absorption solution with a concentration of 0.02mol / L, through the incident optical fiber 4 coupling conduction, from the liquid inlet end of the absorption solution along the flow direction of the absorption solution, light with a wavelength of 500nm is passed into the blank solution after 10s. Add 1.5 For phosphoric acid of mL10% (v / v), after the light is absorbed by the sodium nitroprusside absorption solution, it is conducted through the exit optical fiber 11 at its liquid outlet, and the photoelectric converter 12 is used to collect the light intensity in real time and convert it into a voltage value, according to the formula

[0064] A 空白 = lg(I 0 / I t0 )

[0065] where I 0 is the...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 杜建修杨雪梅
Owner SHAANXI NORMAL UNIV
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