1、 Compliant with standards

In accordance with the national standard HJ970-2018, water quality - Determination of petroleum class - UV spectrophotometric method“

2、 Technical principles

According to the HJ970-2018 standard, after extraction and dehydration with n-hexane, and adsorption of animal and vegetable oils with magnesium silicate, the absorbance was measured at a wavelength of 225 nm, which conforms to Lambert Beer's law.

3、 Department using the instrument

Environmental monitoring systems, petrochemicals, hydrology and water conservancy, tap water, 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 and other testing rooms and laboratories are used.

4、 Application scope of the instrument

This standard is applicable to the determination of petroleum in surface water, groundwater, and seawater.

When the sampling volume is 500 ml, the extraction solution volume is 25 ml, and a 2 cm quartz colorimetric dish is used, the detection limit of the method is 0.01 mg/L, and the lower limit of determination is 0.04 mg/L.

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 0.001mg/L

Basic measurement range: 0.0-60mg/L

Repeatability RSD ≤ 1% (11 measurements of 4-20mg/L oil sample)

Accuracy error<± 2%

Correlation coefficient R ≥ 0.9995 (0, 1, 2, 4, 8, 16mg/L)

Scanning speed: single wavelength scanning for 1 second/time, 225nm characteristic peak scanning for 15 seconds/time

Wavelength range 190 nm~1100 nm

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

Wave number accuracy and repeatability ± 0.5cm-1

Measure the transmittance of n-hexane at 225nm, which is greater than 95%

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

The external dimensions of the host are 45cm × 34cm × 30cm (length, width, height)

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

6、 Technical features

1) Convenient and fast: The software automatically calls the standard curve and extraction ratio, without the need to input parameters. It can directly measure the oil concentration in water without manual calculation upon startup;

2) Accurate wavelength correction and strong anti-interference ability. The company can be equipped with UV oil standard filters for one click calibration, and multiple calibrations do not require reagents;

3) Real time, rapid and automatic measurement of n-hexane purity or transmittance;

4) The measurement of 225nm only takes 1 second, and the scanning measurement of 225nm characteristic peak spectrum only takes 15 seconds. The accuracy of the sample can be traced through the absorption peak spectrum;

5) It can be equipped with an SE-3KS fully automatic extractor system to achieve fully automatic quantitative liquid feeding, extraction, separation dehydration, and oscillation adsorption, eliminating the contact of toxic reagents for health and safety;

6) Equipped with a 2cm automatic quadruple cell, achieving one click calibration and automatic switching measurement for multiple samples;

7) Built in 11 inch touch computer terminal, can also be connected to an external desktop computer, fully compatible with Windows operating system, with intelligent processing of information, storage, printing and saving functions;

8) Convenient calibration: Single point and multi-point automatic detection and calibration, reducing the workload of operators;

9) Specialized UV grating with a dazzling wavelength of 225nm, specifically designed for oil analysis scanning, high accuracy, and good repeatability;

10) Baseline stability: zero point automatic real-time adjustment (eliminating the impact of baseline drift);

11) The standard curve has a long usage time and does not need to be replaced for 1 to 2 years. It automatically brings in the automatic regression curve, making the operation more convenient.