I. Overview

1.1 Introduction

Complies with the following national standards:

The National Standard of the People's Republic of China "HJ637-2018 Water Quality-Determination of Petroleum and Animal and Vegetable Oils-Infrared Photometry"

Basic technical principles:

According to HJ637-2018 standard, the oil in water is extracted with tetrachloroethylene, and the total extract is determined. The extract is adsorbed by magnesium silicate to remove polar substances such as animal and vegetable oils, and the petroleum is determined. The contents of total extracts and petroleum are determined by wavenumbers of 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). C-H bond stretching vibration) absorbance at the bands A2930, A2960 and A3030 were calculated. The content of animal and vegetable oils is calculated according to the difference between the total extract and the content of petroleum

1.2  Instrument product features

1. Fully automated: The process of oil measurement is fully automated, including automatic sampling, extraction, water removal and filtration, measurement, drainage, and cleaning;

2. Health and safety: Extraction and other operations do not require the participation of analysts, eliminating contact with tetrachloroethylene and ensuring the health and safety of operators;

3. The extraction method complies with the national standard HJ637-2018, the extraction results are consistent with the results of the national standard method, and there is no dispute over the extraction method;

4. The imported filter device replaces the function of anhydrous sodium sulfate and effectively removes water and impurities;

5. The entire extraction system adopts acid-proof, tetrachloroethylene-proof, full-corrosion-proof, non-lipophilic PTFE material, and runs an effective cleaning process, which can minimize the cross-contamination of high and low concentration water samples;

6. The instrument can be upgraded to measure the content of mineral oil and animal and vegetable oil,

7. Spare parts quality assurance: Imported solenoid valves and air pumps are used to ensure the durability of the instrument and effectively reduce the failure rate;

8. The real three-wave number, the infrared three-wave number spectrum is clear, the scale is accurate, and the absorption spectrum and absorbance generated by the three wave numbers can be clearly displayed;

9. Using Windows XP and Windows7 or Windows8 operating system control;

10. Adopt USB2.0 interface technology or industrial serial port technology;

11. The standard curve can be completed automatically, just prepare a series of standard oil, and automatically complete the measurement of each oil sample;

12. The extraction process conditions are constant, the detection process is fully automated, manual errors are eliminated, and the parallelism and accuracy of the measurement results are improved;

13. The extraction process can be changed according to the time required and the particularity of the water sample, which is suitable for the detection of special water samples in special environments;

14. Fast speed: It only takes about 10 minutes for each sample to print the analysis results from injection;

15. One-key completion: blank adjustment and multiple water sample detection can be completed with one key, reducing the workload of operators;

16. Manual and automatic, free operation, easy switching, easy to use;

17. Suitable for high-intensity and multi-task work environment;

18. It has the functions of intelligent automatic processing of information, storage, printing and saving as excel documents;

19. The software adopts a more humanized human body physical function design, and the operation is more convenient and fast.

 Main performance indicators of the instrument

1. Instrument detection limit: 0.02mg/L (measure 11 blanks and calculate 3 times SD)

1. Wave number range: 3400cm-1～2400cm-1（2941nm～4167nm）

2. Absorbance range:0.0000～2.0000AU（transmittance 100～1%T）

3. Minimum detectable concentration: 0.002mg/L (enrichment extraction method)

4. Maximum measurement concentration: 10000mg/L (dilution measurement)

5. Instrument measuring range: (0.05～180) mg/L

6. Repeatability RSD: ≤1% (20-100mg/L oil standard sample was measured 11 times)

7. Measurement accuracy: error <±5 %

8. Linear correlation coefficient: R>0.999

9. Water sample volume: 5ml—600ml

10. Extraction amount of tetrachloroethylene: integer multiple of 10 or 20ML

11. Automatic detection of a single sample: 7-18min (the more samples, the longer the extraction time)

12. Wavenumber accuracy: ±1cm-1

13. Host net weight: 25kg

14. Power supply: (220±22)V, (50±1)Hz, 50VA

15. Use temperature and humidity: temperature range 1℃-40℃; humidity≤80﹪

16. Dimensions of the host: 450mm (length) × 350mm (width) × 380mm (height)

1.4  Main purpose and scope of application

1. Can be used for: domestic sewage, mineral oil, animal and vegetable oil in industrial wastewater, and oil fume emission detection in the catering industry;

2. Applicable to: environmental monitoring stations, hydrological stations, petrochemicals, machinery, power plants, automobiles, aircraft, steel manufacturing, pharmaceuticals, agricultural science and technology, marine transportation and other enterprises and institutions.