Method for measuring concentration of silicate in high-concentration hydrogen sulfide hydrothermal solution

A hydrogen sulfide, high-concentration technology, applied in the field of nutrient salt analysis, can solve problems such as complex operation, and achieve the effect of simple operation, high accuracy and good stability

Active Publication Date: 2016-09-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation method is to add excess bromine water to the acidified seawater, the sulfur ion is oxidized into sulfur element, the sulfur element is filtered, and air is introduced to remove excess bromine, but bromine is difficult to be removed, and the unremoved bromine Directly affect the color reaction in silicon molybdenum blue spectrophotometry, and the operation of this method is relatively complicated; the acidification method is to acidify seawater and then pass high-purity nitrogen gas to remove hydrogen sulfide gas, this method cannot completely remove hydrogen sulfide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Take some hydrothermal water samples, and use a sulfur ion selective electrode to measure the concentration of sulfur ions in the high-concentration hydrothermal water samples to be 150 μM;

[0020] (2) Get silicate solution, add sodium sulfide solution, prepare silicate-sulfide ion standard solution, make the concentration of sulfur ion in the standard solution substantially consistent with water sample;

[0021] (3) Measure two parts of 90mL silicate-sulfide ion standard solution of the same concentration, one part is added to 100mL beaker A, and one part is added to 100mL volumetric flask B;

[0022] (4) In beaker A, add dilute sulfuric acid to adjust the pH to 5.00, record the amount V of dilute sulfuric acid used 1 mL, according to V 1 mL to adjust the pH of the solution in the volumetric flask to 5.00;

[0023] (5) Add 1.0mL 0.5mol / L zinc sulfate solution into 100mL volumetric flask B, the solution becomes turbid, use deionized water to make up to 100mL, sha...

Embodiment 2

[0028] (1) The laboratory prepares simulated high-concentration hydrogen sulfide hydrothermal water samples, in which the concentration of sulfide ions is 300 μM and the concentration of silicates is 5.00 μM;

[0029] (2) Get silicate solution, add sodium sulfide solution, prepare silicate-sulfide ion standard solution, make the concentration of sulfur ion in the standard solution substantially consistent with water sample;

[0030] (3) Measure two parts of 90mL silicate-sulfide ion standard solution of the same concentration, one part is added to 100mL beaker A, and one part is added to 100mL volumetric flask B;

[0031] (4) In beaker A, add dilute sulfuric acid to adjust the pH to 6.00, and record the amount V of dilute sulfuric acid used 1 mL, according to V 1 mL to adjust the pH of the solution in the volumetric flask to 6.00;

[0032] (5) Add 3.0mL of 1.0mol / L zinc sulfate solution into 100mL volumetric flask B, the solution becomes turbid, use deionized water to make u...

Embodiment 3

[0037] (1) The laboratory prepares simulated high-concentration hydrogen sulfide hydrothermal water samples, in which the concentration of sulfide ions is 700 μM and the concentration of silicates is 20.00 μM;

[0038] (2) Get silicate solution, add sodium sulfide solution, prepare silicate-sulfide ion standard solution, make the concentration of sulfur ion in the standard solution substantially consistent with water sample;

[0039] (3) Measure two parts of 90mL silicate-sulfide ion standard solution of the same concentration, one part is added to 100mL beaker A, and one part is added to 100mL volumetric flask B;

[0040] (4) In beaker A, add dilute sulfuric acid to adjust the pH to 5.13, record the amount V of dilute sulfuric acid used 1 mL, according to V 1 mL to adjust the pH of the solution in the volumetric flask to 5.13;

[0041] (5) Add 5mL of 1.0mol / L zinc sulfate solution into 100mL volumetric flask B, the solution becomes cloudy, dilute to 100mL with deionized wat...

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Abstract

The present invention relates to a method for measuring the concentration of silicate in a high-concentration hydrogen sulfide hydrothermal solution. The concentration of sulfur ions in a water sample is measured by a sulfide ionic selective electrode, and sulfur ions are removed based on the precipitation method. Firstly, silicate-sulfur ion standard solutions of different concentrations are prepared, and the pH values of the solutions are adjusted to be 5.00-6.00. After that, a zinc sulfate solution is added to precipitate sulfur ions into zinc sulfide precipitates. The solutions are aged for several hours and then are filtered, so that the precipitates in the solutions are removed. Filtrates are obtained for later use. Based on the silico-molybdenum blue spectrophotometry, the absorbance of each filtrate at the wavelength of 810 nm is measured, and then a silicate-sulfur ion standard curve is drawn. In the same condition, the absorbance of the high-concentration hydrogen sulfide hydrothermal solution water sample is measured. Based on the standard curve, the concentration of silicate in the high-concentration hydrogen sulfide hydrothermal solution water sample is figured out. The above method is simple in operation and avoids the measurement trouble caused by easily oxidized sulfur ions. Therefore, the measurement result is more accurate. The reliability of measuring the silicate content in the hydrothermal solution is improved.

Description

technical field [0001] The invention belongs to the field of nutrient salt analysis, and relates to a method for measuring silicate concentration in high-concentration hydrogen sulfide hydrothermal solution. Background technique [0002] Silicon is a nutrient salt necessary for the growth of many organisms in the ocean and land. It has an important impact on the composition of plankton in the ocean. The submarine hydrothermal system is a special part of the marine ecosystem. The distribution and changes in hydrothermal systems are of great significance to the study of the distribution of biological communities, ecological environment effects and ecological evolution in hydrothermal systems. At present, the most classic silicate determination method in marine monitoring regulations is silicon-molybdenum blue spectrophotometry. However, in hydrothermal fluids with high concentrations of hydrogen sulfide, sulfide ions are easily oxidized into simple sulfur, which interferes wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 郑豪徐长栋陈镇东陈建芳
Owner ZHEJIANG UNIV
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