Infrared spectrophotometer

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发布日期：2026-01-05

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Oil is composed of various hydrocarbons, including CH, CH2, and CH3, which are inherent properties of various petroleum products. These compounds represent the overall oil composition. Due to the use of tetrachloroethylene instead of carbon tetrachloride, some definitions need to be revised: "Oil is defined as the absorption value of a substance that can be dissolved in tetrachloroethylene and whose infrared background absorption value is subtracted from the tetrachloroethylene absorption value at wavenumbers (3030 cm⁻¹, 2930 cm⁻¹, and 2960 cm⁻¹)." These wavenumbers (3030 cm⁻¹, 2930 cm⁻¹, and 2960 cm⁻¹) are the characteristic infrared absorption values of CH, CH2, and CH3, respectively. CH, CH2, and CH3 are inherent characteristics of various petroleum products worldwide. As long as the bond energies (absorbance) of CH, CH2, and CH3 in a sample can be measured, the oil content in the oil product can be determined. Infrared spectrophotometers rely on these properties of oil to detect the absorbance of oil at three wavenumbers (3030 cm⁻¹, 2930 cm⁻¹, and 2960 cm⁻¹) for quantitative analysis.

It can be used for: detecting emissions of mineral oil and animal/vegetable oil in surface water, groundwater, domestic sewage, industrial wastewater, soil, and exhaust fumes and mists;

Suitable for: environmental monitoring stations, hydrological stations, petrochemical, machinery, automotive, and aircraft manufacturing enterprises and institutions; pharmaceutical, agricultural technology, and marine transportation industries.

The composition of petroleum substances is very complex and varies depending on the origin. The main components of petroleum are hydrocarbons (alkanes, cycloalkanes, and aromatics). In infrared absorption spectroscopy, due to variations in the proportions of methylene CH2 groups and methyl CH3 groups to ar-h aromatics from different sources, correction coefficients are calculated: X is the methylene CH2 group coefficient, Y is the methyl CH3 group coefficient, and Z is the ar-h aromatic coefficient. Then, the ratio of the wavenumbers of methylene CH2 at 2930 cm⁻¹ to 3030 cm⁻¹ is calculated as F. After determining the values of F, X, Y, and Z, various petroleum substances can be measured to achieve the goal of being unaffected by variations in petroleum production areas.

Equipment Features

1) This product adopts the calibration coefficient method detection principle specified by national standards. It strictly follows the national standard formula, using 20mg/L hexadecane, 20mg/L isooctane, and 100mg/L benzene for calibration. Finally, the instrument calibration coefficient for the measured sample is calculated using the calibration formula (the standard curve method can also be used for detection);

2) This instrument uses the mainstream Android 7.1 system with an 8-inch color screen for operation. All instrument operations can be performed via the touchscreen, which is convenient, fast, and easy to use, just like operating a mobile phone;

3) Built-in wireless network function, which can connect to external WIFI to achieve network upload function;

4) Internal 16GB storage capacity can store 1 million data entries, and data can be directly exported via USB flash drive;

5) Automatic network time synchronization to avoid inaccurate local time due to prolonged instrument use affecting the accuracy of the output voucher time;

6) Powerful background data support. After testing samples, users can not only print the results and save them locally via printer, but also upload them to the cloud platform via WIFI or 4G to connect to the Internet. Database;

7) It not only has basic functions such as detection function settings, curve analysis, and historical data, but also can magnify and reduce the spectrum, allowing users to infinitely refine the spectrum and observe the curve at low concentrations more clearly;

8) Highly automated program application: users can use the Android system to individually test all instrument functions, including automatic wavelength scanning and automatic calibration, making data detection more accurate;

9) One-click program upgrade function: no need for engineers to download on-site, simply insert a USB flash drive to upgrade the APP;

10) Using an electrically modulated light source not only reduces the heat intensity of the light source to facilitate system heat dissipation, but also simplifies the instrument structure and improves instrument reliability by reducing mechanical light cutting motion devices;

11) Real-time automatic zeroing: the instrument collects signals when the light source is emitting and when the light source is off, realizing real-time automatic zero-point adjustment, thereby simplifying operation and improving long-term signal stability;

12) Detachable integrated optical system: the instrument is small in size, has a short optical path, high energy, and the optical path meets the requirements of infrared spectral characteristics, resulting in good stability and a high signal-to-noise ratio;