Palladium content testing method

A detection method and content technology, applied in the field of spectral analysis, can solve the problems that affect the accuracy of the measurement results, many separation steps, and complicated processes, and achieve the effects of small impact, reduced pollution, and simple process

Inactive Publication Date: 2013-03-06
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, there are many separation steps, the process is complicated, and the

Method used

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  • Palladium content testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Palladium standard curve production:

[0028] Palladium standard solution (100mg / L)

[0029] Use a graduated pipette to pipette 0, 1.00, 2.00, 3.00, 4.00, 5.00mL of the palladium standard solution into six 25ml volumetric flasks, slowly add 1.0ml of stannous chloride solution with a concentration of 0.5mol / L and lightly Shake gently, dilute to the mark with (1+6) hydrochloric acid, shake well, let stand for 15 minutes, measure the absorbance A of the test solution at a wavelength of 635nm with a 1cm cuvette.

[0030] Measure the absorbance A at a wavelength of 635nm with a 1cm cuvette and the reagent blank as the reference solution. Take the amount of palladium (in μg) as the ordinate, and the corresponding absorbance value A (in %) as the abscissa, draw a standard curve, and calculate the slope k and intercept b of the standard curve regression equation.

Embodiment 2

[0032] Palladium content detection

[0033] Measuring range: palladium content 0-500μg; if the content of the actual detection object is high, it can be diluted by proportional dilution method for detection.

[0034] Tin protochloride solution configuration (0.5mol / L): take by weighing 11.3g tin protochloride (SnCl 2 2H 2 O), the added concentration is (1+6) hydrochloric acid solution 100ml is dissolved and prepared.

[0035] Accurately weigh and dissolve the substance to be tested, pipette the same volume of test solution and blank solution into two 25ml volumetric flasks, and add 5ml of hydrochloric acid with a concentration of (1+6) at the same time, shake well, then slowly add 1.0ml of hydrochloric acid with a concentration of 0.5mol / L tin protochloride solution and shake gently at the same time, dilute to the mark with hydrochloric acid with a concentration of (1+6), shake well and set aside; the above-mentioned solution to be tested is left for 15 minutes, with a 1cm c...

Embodiment 3

[0038] Specific detection example

[0039] Test sample content: 430 μg, containing platinum and rhodium interferers.

[0040] The absorbance measured by two parallel samples is as follows: Table 1

[0041] sample number

Sample 1

Sample 2

Absorbance A(%)

36.92

36.55

Sample determination content (μg)

422.9

418.7

Relative error(%)

-1.65

2.63

[0042] Table 1 shows that the measurement error meets the requirements.

[0043] Standard curve determination data: Table 2

[0044] Palladium content (ug)

Absorbance A(%)

0

0

100

8.34

200

17.18

300

26.28

400

34.92

500

43.69

[0045] To make a standard curve: such as figure 1 , the slope of the standard curve regression equation k=11.389: intercept; b=2.4679.

[0046] Standard curve: m=11.389A+2.4679

[0047] The linear correlation coefficient R satisfies R 2 =0.9999, indicating t...

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Abstract

The invention discloses a method for determining palladium by spectrophotometry. The method comprises the following steps that liquid to be tested and standard solution are prepared; the liquid to be tested and the standard solution measure the absorbancy A of test solution at a wavelength of 635nm; a standard curve is established according to the standard palladium solution with different concentrations and the corresponding absorbancy, and the slope k and the intercept b of the regression equation of the standard curve are calculated; and the amount of palladium m is calculated to be equal to kA plus b according to the equation. According to the palladium content testing method, the palladium can be directly determined without separating platinum, rhodium and other substances when the platinum, rhodium and other substances which do not affect the absorbancy at the wavelength of 635nm exist in a tested substance, and a process is simple and quick; the resistance to the interference of platinum, rhodium and the like is strong, the impact of an appropriate amount of platinum, rhodium and the like on a determination result is small, and the method is particularly applicable to the determination in a production process of a catalytic converter; the content of palladium is determined to be high and can reach 500mu.g; and compared with existing stannous chloride-acetone-potassium iodide spectrophotometry, the used amount of stannous chloride is only one tenth, so that the pollution is reduced, and the inspection cost is saved.

Description

technical field [0001] The invention belongs to the technical field of spectroscopic analysis, in particular to a method for detecting palladium content by spectrophotometry. Background technique [0002] At present, there are many detection methods for palladium content, such as inductively coupled plasma spectrometry (ICP method), atomic absorption spectrometry (AAS), dimethylglyoxime precipitation-EDTA complexometric titration, stannous chloride-acetone- Potassium iodide single-wavelength spectrophotometry, etc. [0003] Inductively coupled plasma spectrometry and atomic absorption spectrometry: the price of the instrument used is as high as hundreds of thousands, the one-time investment is large, the spare parts and gas are consumed, the analysis cost is high, and other interfering elements must be separated before the measurement. The process is complicated and cannot be separated Sometimes other elements interfere with the determination and affect the accuracy of the ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 王科李晓婧谢兰何晓会曹洪达
Owner SINOCAT ENVIRONMENTAL TECH
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