Compliant with standards:

This instrument is fully based on and complies with the latest national environmental protection standards of the People's Republic of China issued and implemented in 2018

HJ 637-2018 Water Quality - Determination of Petroleum, Animal and Vegetable Oils - Infrared Spectrometric Method

Compliant with national standard: "GB3838-2002 Surface Water Environmental Quality Standard"

Compliant with national standard: "GB18483-2001 Emission Standard for Cooking Fumes in the Catering Industry"

Compliant with national standard: "GB18918-2002 Pollutant Discharge Standard for Urban Sewage Treatment Plants"

Scope of application:

This instrument is suitable for detecting the total oil, petroleum or animal and plant oil content in various types of water bodies such as surface water, groundwater, industrial wastewater, domestic sewage, seawater, fishery aquaculture water, farmland irrigation water, etc. It can also be used for detecting the oil content in cooking fumes in the catering industry. The detection principle is completely consistent with the current detection standards for the above-mentioned industries or water bodies.

Detection principle:

According to HJ637-2018 standard, extract the oil substances in the sample with tetrachloroethylene, determine the total oil, and then use the extraction solution toAdsorption of magnesium silicate, removal of polar substances such as animal and vegetable oils, and determination of petroleum products. The content of total oil and petroleum is divided by wave numberDo not calculate the absorbance A2930, A2960, and A3030 at the 2930cm-1 (stretching vibration of C-H bond in CH2 group), 2960cm-1 (stretching vibration of C-H bond in CH3 group), and 3030cm-1 (stretching vibration of C-H bond in aromatic ring) spectral bands. The content of animal and vegetable oils is calculated based on the difference between the total extract and petroleum content.

Instrument features:

1. Fully compliant with the latest national standards, true three wave number detection, clear display of infrared three wave number spectrum, absorbance and transmittance

2. A professionally developed integrated optical system with short optical path length, strong energy, meeting the requirements of infrared spectroscopy, good stability, and high signal-to-noise ratio

3. By using electrically modulated light sources, the heating intensity of the light source is reduced to ensure the heat dissipation and stability of the instrument. At the same time, mechanical cutting devices are reduced to improve the reliability of the instrument

4. The grating rotation is controlled by a precision stepper motor, which has automatic wavelength calibration function, high wavelength accuracy, and good repeatability

5. Adopting self-developed weak signal conditioning circuit, effectively shielding noise interference, greatly improving detection accuracy and detection limit

6. The instrument can automatically zero, and high-precision infrared detectors accurately collect signals when the light source emits and extinguishes, perform real-time zero point automatic correction, effectively eliminate the influence of baseline drift, and improve the stability and repeatability of detection data

7. The instrument operating system can flexibly select detection schemes and support the use of various extraction agents such as carbon tetrachloride and tetrachloroethylene

8. The instrument has the function of detecting the purity of the extraction agent to effectively avoid detection data errors caused by the purity of the extraction agent not meeting the standard

9. The detection system software can achieve spectral scanning and sample detection functions, display detailed information such as spectra, absorbance, and wavenumber, and flexibly select different ranges, extraction liquid volumes, and sample volumes. It has functions such as data storage and mathematical statistics

10. The instrument has a built-in touch screen and a built-in control system, which can achieve all the functions of the above detection system without connecting to a computer

11. Integrated design of injection system and water sample treatment system, significantly reducing the footprint

12. The entire process of sample testing is automated, achieving functions such as automatic injection, automatic extraction, automatic water removal, automatic detection, automatic storage, and automatic cleaning. It can automatically and continuously detect 10 samples

13. The fully enclosed automatic extraction function ensures that personnel do not need to come into contact with the extraction agent during the entire detection process, thereby improving safety

14. Using imported oil-water separation membrane instead of anhydrous sodium sulfate to filter out water and impurities, with a longer service life

15. High precision syringes are used to quantitatively add liquid volume, and the extraction ratio can be adjusted according to needs

Performance parameters:

1. Baseline stability: zero point real-time automatic correction, no baseline drift impact

2. Detection limit of the method: 0.01mg/L

3. Minimum detectable concentration: 0.0006mg/L

4. Maximum measured concentration: 100% oil

5. Basic measurement range: 0-800mg/L

6. Accuracy error: ≤ 2%

7. Repetitive error: RSD≤1%

8. Linear correlation coefficient: R>0.999

9. Wave number range: 3400cm-1 to 2400cm-1 (2940nm to 4167nm)

10. Wave number accuracy: ± 1cm-1

11. Wave number repeatability: ± 1cm-1

12. Absorption range: 0.00000-2.00000AU (i.e. transmittance of 100-1% T)

13. Scanning speed: Full spectrum scanning for 30 seconds/time, non dispersive infrared method for 2 seconds/time

14. Automatic injection quantity: 10

15. Sample analysis time: 5-10 minutes for a single sample