The infrared spectrophotometer, based on the principle of infrared spectral absorption, exhibits the core advantages of broad-spectrum, high accuracy, and strong adaptability in the detection of oil substances. Compared with other technologies, it is more suitable for the full component analysis of complex samples; UV spectrophotometry, non dispersive infrared spectroscopy, and fluorescence spectrophotometry have advantages in speed, cost, or portability in specific scenarios, but they have limitations in terms of component coverage or anti-interference ability.
1、 The principle differences between infrared spectrophotometer and other oil measurement techniques
Infrared spectrophotometer oil analyzer: Based on infrared spectral absorption method, it analyzes the composition of oil by detecting the absorption spectral lines of the sample in the infrared region. The core principle is to use the characteristic absorption peaks of petroleum substances at specific wavelengths, combined with Lambert Beer's law, to calculate oil concentration. This technology can perform full spectrum scanning on samples to achieve qualitative and quantitative analysis.
UV spectrophotometer: Based on UV spectrophotometry, the content of petroleum is quantitatively analyzed by measuring the absorbance of the sample in the ultraviolet region. The principle is based on the absorption characteristics of aromatic compounds in oil substances towards ultraviolet light, but it can only detect oil components containing aromatic rings and cannot cover non aromatic substances such as alkanes.
Non dispersive infrared oil analyzer: using single point measurement technology, quantitative analysis is carried out by detecting the absorption intensity of oil substances at specific infrared wavelengths. Due to the complex composition of oil, single point measurement is susceptible to interference from other substances, resulting in significant deviation in results, and has gradually been phased out.
Fluorescence photometry: using the characteristic of oil substances producing fluorescence under ultraviolet light excitation for detection. This method has high sensitivity, but its detection range is limited and only applicable to specific types of oil substances.
2、 Performance comparison between infrared spectrophotometer and other oil measurement techniques
Accuracy and sensitivity:
Infrared spectrophotometer oil analyzer: using the three wave number correction coefficient method, it has high accuracy and can perform full spectrum scanning of samples, which can be used for both quantitative measurement and qualitative analysis. Its detection limit is low, measurement range is wide, and it can meet the analysis needs of various complex samples.
UV spectrophotometer oil analyzer: high sensitivity, fast measurement speed, but small range, and due to its single point measurement, it cannot represent the true oil content in water.
Non dispersive infrared oil analyzer: Low accuracy, due to the fact that oil substances are composed of multiple components, measuring a single absorption peak can result in significant errors in the results.
Fluorescence photometry: High sensitivity, but limited detection range, and susceptible to interference from other fluorescent substances.
Anti interference capability:
Infrared spectrophotometer oil analyzer: Through full spectrum scanning and three wave number correction, it can effectively eliminate the influence of interfering substances such as moisture and suspended solids in the sample, ensuring the accuracy of the detection results.
UV spectrophotometer: Although n-hexane is used as the extractant, it may still be interfered by other organic compounds when processing complex samples.
Non dispersive infrared oil analyzer: has weak anti-interference ability and is susceptible to interference from other infrared absorbing substances in the sample.
Fluorescence photometry: susceptible to interference from other fluorescent substances, resulting in biased detection results.
Scope of application:
Infrared spectrophotometer oil analyzer: widely used in various fields such as environmental monitoring, industrial testing, petrochemicals, biomedicine, agricultural environmental monitoring, etc. It can detect the content of petroleum and animal and vegetable oils in surface water, groundwater, industrial wastewater, and domestic sewage, as well as oil pollutants in soil and atmosphere.
UV spectrophotometer oil analyzer: mainly suitable for the determination of petroleum in surface water, groundwater, and seawater, especially for the detection of low concentration oil samples.
Non dispersive infrared oil analyzer: suitable for oil analysis under a single absorption peak, but has gradually been phased out.
Fluorescence photometry method: suitable for detecting specific types of oil substances, such as monitoring crude oil spills.
3、 Comparison of Operation and Cost between Infrared Spectrophotometer and Other Oil Testing Technologies
Convenience of operation:
Infrared spectrophotometer oil analyzer: The operation is relatively complex and requires professional personnel for sample processing and instrument operation. But some models have already achieved automated operations, such as automatic sampling, automatic extraction, automatic cleaning, etc., reducing manual operation errors.
UV spectrophotometer oil analyzer: relatively simple operation, good precision, stable performance, can meet various application requirements of customers.
Non dispersive infrared oil analyzer: easy to operate, but the accuracy of the results is relatively low.
Fluorescence photometry: The operation is relatively simple, but it requires professional personnel to interpret the results.
Cost and maintenance:
Infrared spectrophotometer oil analyzer: The equipment cost is high, but the detection accuracy is high, suitable for long-term, high-frequency oil detection needs. Its maintenance cost is relatively high, requiring regular replacement of key components such as light sources and detectors.
UV spectrophotometer oil analyzer: The equipment cost is relatively low, and the maintenance cost is also relatively low. But the cost of using extractants needs to be taken into account.
Non dispersive infrared oil analyzer: The equipment cost is relatively low, but due to the low accuracy of the results, it has gradually been phased out.
Fluorescence photometry: The equipment cost is high and the detection range is limited, making it suitable for oil detection in specific scenarios.