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A kind of detection method of phosphine concentration in aqueous solution

A detection method and aqueous solution technology, applied in the direction of color/spectral characteristic measurement, etc., to achieve good sensitivity and specificity, and good stability

Active Publication Date: 2017-10-10
CHINESE ACAD OF INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the detection of phosphine concentration using the MTS / PMS system. For the first time, we found that the phosphine molecule also has a similar function. Therefore, this principle can be used to detect phosphine

Method used

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  • A kind of detection method of phosphine concentration in aqueous solution
  • A kind of detection method of phosphine concentration in aqueous solution
  • A kind of detection method of phosphine concentration in aqueous solution

Examples

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Embodiment 1

[0058] This embodiment is a detection method for the concentration of phosphine in the phosphine solution. The phosphine solution to be detected is a water sample with a lot of sludge and severe green algae in Beijing Beitucheng Park. The detection method specifically includes The following steps:

[0059] (1) Mix the 1×PBS solution (PH is 7.2) with the volume ratio of 5:1 with the PBS solution of MTS and PMS, react at room temperature for 10min to obtain the mixed solution b after the reaction, use b as the reference solution, and Detect the absorbance of the reference solution within the range of 470-510nm, measure in parallel 3-6 times, and take the average value as the zero point;

[0060] (2) Take 100ul of the aqueous solution to be tested and react with the PBS solution of 20ul of MTS and PMS, react at room temperature for 10min to obtain the mixed solution A after the reaction, detect the absorbance of said A in the range of 470 to 510nm, and measure in parallel for 3 t...

Embodiment 2

[0068]This embodiment selects the aqueous solution (5ug / ml) of known concentration of phosphine to detect, and detection method is exactly the same as embodiment 1, and the concentration of the phosphine obtained through detection is 5.05 ± 0.09ug / ml, and error is 1 %.

Embodiment 3

[0070] The difference between this example and Example 1 is that the pH value of the 1×PBS solution in step (1) and step (2) is different. In this example, the pH of the 1×PBS solution is 6.0. In this example, MTS The detection result of / PMS detection method is 1.03±0.04ug / ml.

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Abstract

The invention relates to a method for detecting the concentration of phosphine in an aqueous solution, comprising the following steps: (1) detecting the absorbance of a reference solution, and taking the average value as the zero point; Mix and react the aqueous solution with the aqueous solution of MTS or the PBS solution of MTS to obtain the mixed solution A after the reaction, detect the absorbance of A, measure in parallel at least 3 times, and take the average value; (3) if the average value of the absorbance of A is different from that of the reference If there is no significant difference in the average value of the absorbance of the solution, then the aqueous solution to be tested does not contain phosphine; if there is a significant difference, the detected absorbance is compared with the absorbance-concentration curve to obtain the concentration of phosphine in the aqueous solution to be tested. concentration. The detection method of the invention is convenient and fast, has good sensitivity and specificity, and is suitable for rapid detection of phosphine on site and in a laboratory.

Description

technical field [0001] The invention relates to the field of chemical detection, in particular to a method for detecting the concentration of phosphine in an aqueous solution. Background technique [0002] Phosphine, the English name is Phosphine, the chemical formula is PH 3 , The relative molecular mass of phosphine is 34, the density is 1.5307g / L (in standard state), heavier than air (1.29g / L), and the relative density is 1.18 (air is 1). Under normal circumstances, phosphine is a colorless, flammable and highly toxic gas with a characteristic odor of mustard and garlic, and industrial products have a rotten fish-like odor. The concentration of phosphine in the air is greater than 26g / m 3 or 1.79%, it will explode and produce white smoke (P 2 o 5 ). Pure phosphine will only burn when heated above 100°C, but if phosphine contains biphosphine (P 2 h 4 ), it is easy to spontaneously ignite when exposed to the air, that is, the phenomenon of "wild fire". Similar to am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 刘涛李丽张广平龚绍润王跃进
Owner CHINESE ACAD OF INSPECTION & QUARANTINE