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An Infrared Spectrophotometric Method for Rapid Determination of Oil in Water Without Using CFC Reagents

A technique for rapid determination of CFCs, applied in the field of infrared spectrometry, to achieve the effect of stable method and rapid determination of targets

Active Publication Date: 2016-05-25
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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  • An Infrared Spectrophotometric Method for Rapid Determination of Oil in Water Without Using CFC Reagents
  • An Infrared Spectrophotometric Method for Rapid Determination of Oil in Water Without Using CFC Reagents
  • An Infrared Spectrophotometric Method for Rapid Determination of Oil in Water Without Using CFC Reagents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 (A1750~1735—olive oil mass-volume concentration curve drawing)

[0032] 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:

[0033] Table 1A1750~1735—Olive Oil Mass-Volume Concentration

[0034]

[0035] Infrared spectrum such as figure 1 .

Embodiment 2

[0036] 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)

[0037]a. Take 10 beakers and 10 50mL volumetric flasks, paste the names of animal and vegetable oils (olive oil, soybean oil, palm oil, coconut oil, rapeseed oil), pour a small amount of animal and vegetable oils into the beakers, 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.

[0038] T...

Embodiment 3

[0045] Prepare mixed hydrocarbons with n-hexadecane, isooctane and benzene at a ratio of 65:25:10 (V / V), and commercially available olive oil, soybean oil, palm oil, coconut oil, rapeseed oil, peanut oil, pork Prepare mixed animal and vegetable oils with oil and tallow according to the ratio of 1:1:1:1:1:1:1 (V / V), pipette 5 μL each of mixed hydrocarbons and mixed animal and vegetable oils into 500ml 0.1M Na 2 S solution, 0.1M sulfuric acid solution and distilled water, set 2 samples for each, fully shake and mix to make simulated (wastewater) water samples. Two samples of each water sample were determined by this method and HJ637-2012, see Table 4. The results show that the water sample pretreatment step of this method is effective, and there is no significant difference between this method and HJ637-2012 method.

[0046] Table 4 Validation of water sample pretreatment steps of this method and comparison with HJ637-2012 test results

[0047]

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PUM

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Abstract

The invention discloses an infrared photometry method for quickly measuring oil in water without using chlorofluorocarbon reagents, and belongs to the field of infrared spectrum detection. The steps are: (1) collect samples, control the pH to 3-3.5, add analytical pure iron powder and ferrous chloride solution; (2) extract the oil in the water by carbon disulfide, and dry it with anhydrous calcium chloride; (3) ) The extract is measured with a CaF2 window cuvette; (4) The mass-volume concentration of the total oil is determined by measuring the infrared absorption of the extract with a Fourier infrared spectrometer; The infrared absorption of cm-1 determines the molar concentration of animal and vegetable oils, and calculates the mass-volume concentration of animal and vegetable oils; (6) The mass-volume concentration of total oils is subtracted from the mass-volume concentration of animal and vegetable oils to obtain the mass-volume concentration of petroleum . This method can still achieve rapid determination of oil in water after CFC reagents are banned.

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 in foreign countries mainly include EPA (1978) Method418. The extraction agent used is slightly different, but the detection process used is after the pretreatment of the extract, the first scan of the (total) extract to determine the mass-volume concentration (mg / L) of the total oil, through the adsorption of magnesium silicate The animal and vegetable oils in the (total) extract are removed, and the extract after removing the animal and vegetable oils is scanned for the second time to determine the mass-volume concentration of petroleum. The difference between the mass-volume concentration of total oil and the mass-volume concentration of petroleum is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3577
Inventor 唐松林
Owner JIANGSU GUOCHUANG ENVIRO PROTECTION TECH CO LTD