1. Compliant with standards

HJ637-2018 Determination of Petroleum, Animal and Vegetable Oils in Water Quality by Infrared Spectroscopy

2. Technical principles

According to HJ637-2018 standard, oil substances in water are extracted with tetrachloroethylene, the total extract is determined, and then the extract is adsorbed with magnesium silicate. After removing animal and vegetable oils and other substances, petroleum substances are determined. The total extract and petroleum content were calculated based on the absorbance A2930, A2960, and A3030 at spectral bands with wave numbers of 2930 cm-1 (stretching vibration of C-H bond in CH2 group), 2960 cm-1 (stretching vibration of C-H bond in CH3 group), and 3030 cm-1 (stretching vibration of C-H bond in aromatic hydrocarbon), respectively. The content of animal and vegetable oils is calculated based on the difference between the total extract and petroleum content.

3. Department using the instrument

Environmental monitoring systems are used in testing rooms and laboratories for petrochemical, hydrological and water conservancy, water supply companies, sewage treatment plants, thermal power plants, steel enterprises, scientific research and teaching in universities, agricultural environmental monitoring, railway environmental monitoring, automobile manufacturing, marine environmental monitoring, transportation environmental monitoring, environmental research, etc.

4. Application scope of the instrument

This instrument is mainly used for measuring oil content in surface water, groundwater, and industrial wastewater. It can also be used for monitoring oil content in flue gas and solids in the catering industry. This instrument is used to measure the oil content in water, gases, and solids.

5. Technical indicators

Technical indicators of the project

The detection limit of the instrument is 3SD ≤ 0.02mg/L (measure 11 times blank and calculate 3 times standard deviation)

Method detection limit (water sample) 0.002mg/L

Water sample measurement range 0.0- * * * oil (dilution or enrichment extraction measurement method)

Repeatability RSD ≤ 1% (tested 11 times for 20-100mg/L oil standard sample)

Measure the absorbance of 2930cm-1 tetrachloroethylene:< 0.2（A）

Aromatic hydrocarbon detection limit 2mg/L (benzene * * * substance)

Accuracy error<± 2%

Correlation coefficient R>0.9999

Scanning speed: Full spectrum scanning, 30 seconds/time

Wave number range 3400cm-1 to 2400cm-1 (i.e. 2941nm to 4167nm)

The absorbance range is 0.0000-2.0000 AU (i.e. transmittance of 100-1% T)

Resolution 0.001mg/L

Wave number accuracy and repeatability ± 0.5cm-1

Temperature and humidity range: 1 ℃ -40 ℃, humidity ≤ 90%

The external dimensions of the host are 45cm × 35cm × 13cm (length, width, height)

Use power supply (220 ± 22) V, (50 ± 1) Hz, 50VA

6. Technical features

1) Compliant with HJ637-2018, the infrared three wave number and non dispersive single wave number spectra are clear and accurately calibrated, and can clearly display the absorption spectrum and absorbance generated by the three wave number;

2) The manufacturer is equipped with a standard oil filter, which can be calibrated at a single point for a long time. The single standard curve is free of replacement for life and does not require the use of toxic reagents for standard oil;

3) It has the function of measuring instrument calibration coefficient and can calibrate standard curves, single point calibration, multi-point calibration, and curve calibration;

4) Detachable integrated optical system, small size, short optical path, high energy, first splitting and then absorbing, good stability;

5) The instrument workstation adopts a stable NET4.0 operating platform, with a green hard drive version that is free of installation and comes with a software copyright certificate;

6) Controlled by Windows 7 or Windows 10 operating system;

7) It can be equipped with SE-3KS fully automatic extractor to achieve fully automatic quantitative liquid feeding, extraction, separation dehydration, and shaking adsorption of animal and vegetable oils, without contact with toxic reagents, ensuring the health of operators;

8) Good correlation coefficient, measuring 0.5-5 mgL, R>0.9999；

9) The instrument can automatically adjust the wavelength positioning of methylene 2930cm-1 to achieve accurate measurement.

10) The instrument is equipped with an 11 inch touchscreen tablet, an external wireless mouse and keyboard, and can also be operated on an external computer for convenient and fast operation;

11) Zero point real-time adjustment, good baseline stability, no baseline drift effect, using a pyroelectric infrared detector to collect pyroelectric signals when the halogen lamp is on and off;

12) It has functions such as automatic statistical analysis, spectrum display, storage, and printing, and can be remotely controlled and operated through wireless networking;

13) It can detect total oil, petroleum, animal and vegetable oils in water samples, as well as oil in cooking fumes and gases, and oil in solids in the catering industry;

14) Non dispersed and infrared one click switching, easy to operate;

15) Can test the transmittance and purity of the extraction solvent, and distinguish various interferences;