Method for measuring kalium in soil by tetraphenylboron sodium nephelometery and its screening agent

A technology of sodium tetraphenylborate and turbidimetric method, which is applied in the field of laboratory analysis, can solve the problems that formaldehyde is not easy to store for a long time, endangers the health of laboratory personnel, interferes with potassium determination, etc., achieves environmental protection, non-toxic masking performance, and is easy to supply as a finished product , The effect of improving test efficiency

Inactive Publication Date: 2008-09-24
河南农大迅捷测试技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Colorimetric method mainly refers to crown ether DPDB-18-C-6 and bromothymol blue ion-pair extraction photometric colorimetric method, which is rarely used due to the complicated extraction steps in this method; turbidimetric method mainly includes tetraphenylboron Sodium method and sodium cobalt nitrite method, because the sodium cobalt nitrite reagent is highly toxic and expensive, so the sodium cobalt nitrite method is rarely used. The sodium tetraphenylborate turbidimetric method has been the most commonly used method for many years. It is relatively simple to operate, has a certain simplicity and reliability, meets the requirements of rapid measurement, and is widely used. However, in the determination of potassium by sodium tetraphenylborate method, the NH in the sample 4 + It also reacts with sodium tetraphenylborate to generate a white preci

Method used

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  • Method for measuring kalium in soil by tetraphenylboron sodium nephelometery and its screening agent
  • Method for measuring kalium in soil by tetraphenylboron sodium nephelometery and its screening agent
  • Method for measuring kalium in soil by tetraphenylboron sodium nephelometery and its screening agent

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 A masking agent for measuring potassium by sodium tetraphenylborate turbidimetry, containing 0.02mol / L Cu 2+ , 0.08mol / L tartaric acid, [H + ]=7.36mol / L aqueous solution.

[0031] The method for measuring potassium with the sodium tetraphenylborate turbidimetric method of above-mentioned masking agent may further comprise the steps:

[0032] (1) Reagent preparation

[0033] ① Weigh copper sulfate (CuSO 4 ·5H 2 O) 5.0g, tartaric acid (C 4 h 6 o 6 ) 12.0g, dissolved in about 500mL of water, add 200.0mL of concentrated sulfuric acid, after cooling to room temperature, dilute to 1000mL with distilled water, shake well and then dispense into dropper bottles for later use;

[0034] ②Weigh 75.0g of EDTA disodium salt and 130.0g of sodium hydroxide in appropriate amount of water for masking agent. After cooling, distill the volume to 1000mL with distilled water, mix evenly and dispense into dropper bottles for later use;

[0035] ③Turbidity agent Weigh 8.0g of...

Embodiment 2

[0040] Example 2 A masking agent for measuring potassium by sodium tetraphenylborate turbidimetry, containing 0.01mol / L Cu 2+ , 0.067mol / L tartaric acid, [H + ]=6.62mol / L aqueous solution. The method for measuring potassium with the sodium tetraphenylborate nephelometric method of this masking agent may further comprise the steps:

[0041] (1) Reagent preparation

[0042] ① Weigh copper sulfate (CuSO 4 ·5H 2 O) 4.0g, tartaric acid (C 4 h 6 o 6 ) 10.0g, dissolve in 700mL water, add 180.0mL concentrated sulfuric acid, after cooling to room temperature, dilute to 1000mL with distilled water, shake well;

[0043] ② Masking agent Weigh 65.0g of EDTA disodium salt, 140.0g of sodium hydroxide and dissolve in an appropriate amount of water. After cooling, distill the volume to 1000mL with distilled water and mix well;

[0044] ③Turbidity agent Weigh 7.0g of sodium hydroxide and dissolve in 70mL of water, dilute to 100mL after cooling, and set aside; another weigh 65.0g of sodi...

Embodiment 3

[0051] Example 3 A masking agent for measuring potassium by sodium tetraphenylborate turbidimetry, containing 0.032mol / L Cu 2+ , 0.087mol / L tartaric acid, [H + ]=9.2mol / L aqueous solution. The method for measuring potassium with the sodium tetraphenylborate nephelometric method of this masking agent may further comprise the steps:

[0052] (1) Reagent preparation

[0053] ① Masking agent weighed CuSO 4 ·5H 2 O 8.0g, tartaric acid (C 4 h 6 o 6 ) 13.0g, dissolve in 250mL water, add 250.0mL concentrated sulfuric acid, cool to room temperature, dilute to 1000mL with water, shake well.

[0054] ② Masking agent Weigh 70.0g of EDTA disodium salt, 120.0g of sodium hydroxide and dissolve in an appropriate amount of water. After cooling, distill the volume to 1000mL with distilled water and mix well;

[0055] ③Turbidity Agent Weigh 6.0g of sodium hydroxide and dissolve it in 70mL of water, and set the volume to 100mL after cooling, and set aside; another weigh 60.0g of tetraphen...

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Abstract

The invention discloses a method for measuring potassium by the sodium tetraphenylborate turbidimetry and a masking agent which is used by the method. The masking agent is a water solution containing 0.01 to 0.04mol/l of Cu<2+>, 0.04 to 0.10mol/l of tartaric acid and 5 to 10mol/l of H<+>; the method for measuring the potassium by the sodium tetraphenylborate turbidimetry is that: the masking agent is used for masking ammonium ion and other interfering ions in liquid under test, basic EDTA disodium salt solution is further added to carry out the auxiliary masking, basic sodium tetraphenylborate water solution is finally added, and the turbidity measurement is immediately carried out after shaking the reaction solution well. The measurement method has the advantages of simple operation, rapid and accurate measurement and low cost; the linear range thereof meets the requirements of the rapid measurement, which is suitable for the application of grass roots and agriculture popularization departments; and the masking agent used does extremely small harm to the human body and the environment.

Description

technical field [0001] The invention relates to the field of laboratory analysis, in particular to a method for measuring potassium in soil by sodium tetraphenylborate turbidimetry and a low-toxic environment-friendly masking agent. Background technique [0002] The nutrient level of soil potassium mainly depends on the content of available potassium in the soil. The content of available potassium in the soil is an effective indicator for evaluating the level of soil potassium and predicting the response of plants to potassium application. Timely measurement of the content of available potassium in the soil can help to understand its changing trend. It is very necessary to guide the rational application of potassium fertilizer. [0003] At present, the methods for the determination of available potassium in soil mainly include gravimetric method, volumetric method, colorimetric method, turbidimetric method, flame photometer method, atomic absorption method, electrode method ...

Claims

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Application Information

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IPC IPC(8): G01N21/82
Inventor 段铁城贾玮杨素勤赵玉正张广俊郑隆凯李伟华胡建东
Owner 河南农大迅捷测试技术有限公司
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