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Method for digesting total iron in water sample

A water sample and standard water sample technology, applied in the preparation of test samples, thermal excitation analysis, material excitation analysis, etc., can solve the problems of long digestion time, incomplete sample digestion, cross-contamination, etc. Beneficial to health and shortening the pretreatment cycle

Inactive Publication Date: 2012-05-16
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

At present, the digestion of total iron is mainly carried out by using acid to heat and boil in an electric furnace. The main disadvantages are that the digestion time is long, the digestion of each sample cannot be completely uniform, and iron is lost or cross-contaminated with the digestion steam.

Method used

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  • Method for digesting total iron in water sample
  • Method for digesting total iron in water sample
  • Method for digesting total iron in water sample

Examples

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Embodiment Construction

[0017] A water sample total iron digestion method, which uses a sealed, pressure-resistant, temperature-resistant glass reagent bottle, takes a certain volume of water sample, adds an appropriate amount of nitric acid, and the nitric acid does not exceed 5% of the total volume, at 130-150 Heat and digest at ℃, the digested water sample is in a sub-boiling state, and the digestion time is about 20-30 minutes, and the sample is free of turbidity. After standing and cooling, the supernatant is measured by a plasma emission spectrometer. The nitric acid in this example is mixed with water at a ratio of 3:1, the digestion temperature is 138-142°C, and the digestion time is 27 minutes.

[0018] The invention has a wide range of applications and can be applied to drinking water, industrial circulating water, waste water and other water bodies.

[0019] Precision measurement: take the same volume of water samples from the same sample, pretreat with the above method, and the analysis r...

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Abstract

The invention relates to monitoring and analysis of a water body, in particular to a method for digesting total iron in a water body. The method comprises the following steps of: 1, adding the water sample to a sealed, pressure resistant and temperature resistant container, and adding nitric acid to obtain a standard water sample; 2, heating the standard water sample, obtained by the step 1, at temperature of between 130 and 150 DEG C for digestion, wherein the digested standard water sample is at a sub-boiling state until the standard water sample is completely clear; and 3, standing and cooling the standard water sample, obtained by the step 2, and measuring supernatant by a plasma emission spectrometer.

Description

technical field [0001] The invention relates to monitoring and analysis of water bodies, in particular to a method for dissolving iron in water bodies. Background technique [0002] Iron exists in a variety of forms in water samples. It can exist in the form of simple hydrated ions, complex inorganic and organic complexes in the solution; it can also exist in colloids and suspended particles. Iron ions may be di valence, possibly trivalent. Therefore, the instability and inhomogeneity of the sample have a great influence on the analysis results. When analyzing the total iron in the water sample, the sample must be pretreated carefully to decompose the interfering components. At present, the digestion of total iron is mainly carried out by using acid to heat and boil in an electric furnace. The main disadvantages are that the digestion time is long, the digestion of each sample cannot be completely uniform, and iron is lost or cross-contaminated with the digestion steam. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N21/73
Inventor 彭庭辉
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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