Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for automatically analyzing formaldehyde in water

An automatic analysis device and formaldehyde technology, applied in the field of analytical chemistry, can solve problems such as long stabilization time, low sensitivity, and slow analysis speed, and achieve the effects of simple operation, good repeatability, and high accuracy

Active Publication Date: 2018-08-24
BEIJING BAODE INSTR CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the two techniques, the advantages of FIA technique are high sensitivity and fast analysis speed, but the disadvantage is that the reagent needs to be degassed, otherwise the detection process will be greatly disturbed by air bubbles
SCFA itself needs to add air bubbles in the flow path, so the reagent does not need to be degassed, but the SCFA system has a long stable time, low sensitivity, and slow analysis speed, so automatic analyzers using FIA technology are more and more widely used

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for automatically analyzing formaldehyde in water
  • Device and method for automatically analyzing formaldehyde in water
  • Device and method for automatically analyzing formaldehyde in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The automatic analysis device for formaldehyde in water of the present invention is tested using standard samples with concentrations of 0.0, 0.05, 0.10, 0.20, 0.50, 1.0 mg / L of formaldehyde in water as follows.

[0066] The standard solution of formaldehyde in water is purchased from the National Standards Center with a concentration of 1000 mg / L. Dilute the 1000mg / L formaldehyde standard solution with deionized water to 10mg / L and 1mg / L, and use 10mg / L and 1mg / L formaldehyde stock solution in water to make 0.05, 0.10, 0.20, 0.50, 1.0mg / L. Standard sample series.

[0067] The above-mentioned standard samples were analyzed using the automatic analyzer for formaldehyde in water of the present invention, and the results are shown in Table 1.

[0068] Table 1. Analysis results of standard samples:

[0069] Concentration (mg / L)

Absorbance (peak area)

Measured concentration (mg / L)

0

0.634

-0.005

0.05

8.869

0.057

0.1

15.357

0.106

0.2

34.365

0.249

0.5

69.317

0.512

1.0

136.944

1.020

[007...

Embodiment 2

[0080] As in Example 1, under other conditions unchanged, the type of color developer was changed, potassium persulfate was used at a concentration of 10 g / L, and the standard sample of formaldehyde in water was measured. The results are shown in Table 3.

[0081] Table 3. Analysis results of standard samples:

[0082] Concentration (mg / L)

Absorbance (peak area)

Measured concentration (mg / L)

0

0.6067

0.007

0.05

5.6290

0.052

0.1

9.9763

0.091

0.2

22.7129

0.206

0.5

56.4546

0.509

1.0

113.5209

1.021

[0083] C=0.009A-0.0019, r=0.9999

[0084] It can be seen from the results in Table 3 that when potassium persulfate is used as a developer, the sensitivity is not as high as that of hydrogen peroxide, but it can also be used as a developer.

Embodiment 3

[0086] As in Example 1, under other conditions unchanged, the inner diameter of the reaction tube was changed, and the standard solution of formaldehyde in 0.050 mg / L water was measured. The absorbance values ​​are listed in Table 4.

[0087] Table 4 The influence of different inner diameter capillaries on absorbance value

[0088] Pipe inner diameter

[0089] From the results in Table 4, the results of 0.8mm and 1.0mm are relatively close, but 0.8mm has the highest sensitivity, so 0.8mm tube diameter capillary is used.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
lengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a device and a method for automatically analyzing formaldehyde in water. The device for automatically analyzing the formaldehyde in the water comprises an automatic sampler, aperistaltic pump, a chemical reaction part and a detector, wherein the detector is used for detecting the absorbance of a mixed solution. The method for automatically analyzing the formaldehyde in the water comprises the following steps: mixing a sample with ethylene diamine tetraacetic acid (EDTA)-KOH for carrying out a reaction to obtain first mixed liquid; mixing the first mixed liquid with AHMT for carrying out a reaction to obtain second mixed liquid; mixing the second mixed liquid with a color developing agent for carrying out a reaction to obtain third mixed liquid; detecting the absorbance of the third mixed liquid; making a standard curve according to the measured peak height or peak area of the absorbance of a standard solution and the concentration of the standard solution, andcalculating the formaldehyde content of the sample according to the position of the peak height of the sample absorbance on the standard curve. By adopting the technical scheme, the reagents can be automatically added, the sample absorbance and reference absorbance can be automatically determined, and the concentration of the formaldehyde in the sample can be automatically determined; the deviceand the method are high in sensitivity, good in repeatability, high in accuracy, and simple and quick to operate.

Description

Technical field [0001] The invention relates to the field of analytical chemistry, in particular to an automatic analysis device and method for formaldehyde in water. Background technique [0002] Formaldehyde has been identified as a carcinogen and teratogenic substance by the World Health Organization. As a byproduct of disinfection in drinking water, it is a toxicological indicator in drinking water testing indicators. The only method for formaldehyde detection in the standard inspection method for drinking water in my country GB / T 5750.6 is 4-amino-3-hydrazine-5-mercapto-1,2,4-triazole (AHMT) spectrophotometry. The method has high sensitivity and good selectivity. But the main problem of this method is that after AHMT is added, it needs to be placed for 20 minutes before adding potassium periodate solution, shake for half a minute and then placed for 5 minutes and then measure the absorbance. Not only does it take a long time for sample analysis, but also requires accurate ti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/31G01N21/78
Inventor 赵萍孙国伟申童王淦芮
Owner BEIJING BAODE INSTR CO LTD