OIL 480 Infrared Spectrometer for Oil Analysis

meet the standard

National Environmental Protection Standard of the People's Republic of China "HJ637-2018" Water Quality - Determination of Petroleum and Animal and Vegetable Oils - Infrared Spectrometric Method

Technical Principle

According to HJ637-2018 standard, under the condition of pH ≤ 2 in water samples, extract with tetrachloroethylene and determine the oil content; After removing polar substances such as animal and vegetable oils by adsorbing the extract with magnesium silicate, determine the petroleum content. The content of oil and petroleum is calculated based on the absorbance A2930, A2960, and A3030 at wavenumbers 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), respectively, using correction coefficients; The content of animal and vegetable oils is the difference between the content of oil and petroleum.

Application field

Determination of petroleum, animal and plant oils in industrial wastewater and domestic sewage

Technical indicators and related parameter performance

Baseline stability: Real time automatic adjustment of zero point (eliminating the influence of baseline drift), the computer collects both the signal when the light source emits light and the signal when the light source goes off, achieving real-time automatic adjustment of zero point, simplifying operation and improving long-term signal stability;

Software system: Adopting dual system analysis to meet the usage of carbon tetrachloride or tetrachloroethylene as extractants respectively;

Calibration method: The instrument can be calibrated using both standard curves and coefficients, with multiple calibration methods to meet different environmental requirements;

Light source system: The service life of the light source can reach over 5000 hours. The light source uses electrical modulation to regulate the light source technology, preventing the internal temperature of the instrument from affecting stability;

Method detection limit: When the sample volume is 500ml and the extraction solution volume is 50ml, the detection limit is 0.06mg/L;

Instrument detection limit: DL ≤ 0.04mg/L (3 times SD of 11 measurements of tetrachloroethylene blank solution);

Wave number accuracy and repeatability: ± 0.5cm-1. Using automatic positioning calibration, oil samples above 30mg/L are automatically calibrated at 2930cm-1, 2960cm-1, and 3030cm-1, eliminating the influence of human positioning;

Repeatability: RSD ≤ 0.6% for 11 measurements of 30-40mg/L oil standard samples. The instrument's optical and electrical systems are self-contained and highly integrated, thereby improving the reliability and repeatability of the instrument;

Accuracy error: ≤ 1%;

Correction coefficient accuracy: Take an appropriate amount of petroleum standard solution, prepare an appropriate concentration of petroleum standard solution using tetrachloroethylene as the solvent, and measure it using the same steps as the sample, with an error of ± 10%;

Scanning speed: Full spectrum scanning, 30 seconds/time; Non dispersive infrared method 2 seconds/time;

Basic measurement range: 0.0~800mg/L

Minimum detectable concentration: 0.003mg/L (water sample concentration)

Maximum measured concentration: 100% oil

Linear correlation coefficient r>0.999

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

Absorption range: 0.0000-2.0000 AU (i.e. transmittance of 100-1% T)

Host dimensions: 450mm (length) x 400mm (width) x 130mm (height)

Host weight: 12kg

Temperature: -5-45 ℃

Relative humidity: 20% -95%

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

Instrument Features

New layout of electronic components, electromagnetic compatibility, better stability, and structurally more suitable for upgrading (users can easily upgrade from OIL 480 to OIL 510).