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Infrared photometric method for quickly measuring oils in water without using chlorofluorocarbon reagents

A technology for rapid determination of CFCs, applied in the field of infrared photometry, to achieve the effect of rapid determination of targets and stable methods

Active Publication Date: 2013-10-23
JIANGSU GUOCHUANG ENVIRO PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the extraction agent used in the existing infrared photometry method for determining oil in water will be gradually banned, the present invention provides an infrared photometric method for rapidly determining oil in water without using chlorofluorocarbon reagents. After CFC reagents such as carbon tetrachloride, trifluorotrichloroethane, and tetrachloroethylene are disabled, it can still effectively detect oil in water quickly, especially suitable for instant determination in emergency monitoring of pollution accidents

Method used

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  • Infrared photometric method for quickly measuring oils in water without using chlorofluorocarbon reagents
  • Infrared photometric method for quickly measuring oils in water without using chlorofluorocarbon reagents
  • Infrared photometric method for quickly measuring oils in water without using chlorofluorocarbon reagents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Using olive oil as a benchmark to make a standard curve, measure the peak area value (instrument integration) of each concentration, the results are shown in Table 1:

[0032] Table 1 A1750~1735—olive oil mass-volume concentration

[0033]

[0034] Infrared spectrum such as figure 1 .

[0035] Example 2 (taking olive oil as a reference, verifying the conversion coefficient of animal and vegetable oil molar concentration into mass-volume concentration determined by the molecular weight of animal and vegetable oil)

Embodiment 2

[0036]a. Take 10 beakers and 10 50mL volumetric flasks, paste the name of animal and vegetable oil (olive oil, soybean oil, palm oil, coconut oil, rapeseed oil), pour a small amount of animal and vegetable oil into the beaker, and pipette each with a micro syringe Put 5 μL of animal and vegetable oil into a volumetric flask with a corresponding label, use carbon disulfide to make up the volume, and use an oil meter to measure the concentration of each prepared solution. Dilute in an appropriate amount, configure a 50mg / L solution, and measure and confirm the concentration with an oil meter. Table 2 lists the average molecular weight of common animal and vegetable oils and their molecular weight after deducting three O-C=O bonds.

[0037] Table 2 The average molecular weight of common animal and vegetable oils and their deduction of O-C=O bond molecular weight

[0038]

[0039] b. Determination of olive oil, soybean oil, palm oil, coconut oil, rapeseed oil 50mg / L solution a...

Embodiment 3

[0045] Table 4 Validation of water sample pretreatment steps of this method and comparison with HJ637-2012 test results

[0046]

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Abstract

The invention discloses an infrared photometric method for quickly measuring oils in water without using chlorofluorocarbon reagents, belonging to the field of infrared spectroscopy. The method comprises the following steps: (1) collecting a sample, controlling the pH to 3-3.5, and adding and analyzing pure iron powder and ferrous chloride solution; (2) extracting oils in water through carbon disulfide, and drying the oil through anhydrous calcium chloride; (3) measuring the extract liquor through a CaF2 window film cuvette; (4) measuring infrared absorption of the extract liquor through a Fourier infrared spectrum tester to determine the mass-volume concentration of total oils; (5) measuring the infrared absorption of the extract liquor at 1750-1735cm<-1> to determine the mol concentration of vegetable oil, and calculating the mass-volume concentration of the vegetable oil; and (6) subtracting the mass-volume concentration of the vegetable oil from the mass-volume concentration of total oils to obtain the mass-volume concentration of petroleum. The method can be used for quickly measuring oils in water after the chlorofluorocarbon reagents are forbidden.

Description

technical field [0001] The invention belongs to the field of infrared spectrum detection, and more specifically relates to an infrared photometry method for rapidly measuring oil in water without using chlorofluorocarbon reagents. Background technique [0002] The oil measuring methods based on infrared absorption widely used abroad mainly include EPA (1978) Method 418.1, ASTM (2003) Method D 3921-96 and APHA (2000) Method 5520C, which are the same as the newly promulgated national standard HJ637-2012 although The principle and the extraction agent used are slightly different, but the detection process used is that after the extract is pretreated, the first scan (total) extract is used to determine the mass-volume concentration (mg / L) of the total oil, and the silicic acid Magnesium adsorption removes the animal and vegetable oils in the (total) extract, and the extract after removing the animal and vegetable oils in the second scan measures the mass-volume concentration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35
Inventor 唐松林
Owner JIANGSU GUOCHUANG ENVIRO PROTECTION TECH CO LTD
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