Introduction: PD-21A infrared spectrophotometer is mainly used in the measurement of oil content in surface water, groundwater, industrial wastewater, cooking fume, welding wire, welding rod, soil and solids. Features: Use tetrachloroethylene or carbon tetrachloride to extract oily substances in the water, and then use anhydrous sodium sulfate to isolate impurities and water, separate the oil and tetrachloroethylene or carbon tetrachloride solution, and determine the total oil content of the extract . At the same time, the extract can be adsorbed with magnesium silicate, and after removing polar substances such as animal and vegetable oils, petroleum can be determined. The content of the total extracts and petroleum products are respectively 2930cm (the stretching vibration of the CH bond in the CH2 group), 2960cm (the stretching vibration of the CH bond in the CH3 group) and 3030cm (the stretching vibration of the CH bond in the aromatic ring) respectively. The absorbance at the band is calculated. The content of animal and vegetable oils is calculated as the difference between total extracts and petroleum content. technical parameter The lowest detectable concentration: 0.002mg/L ((oil concentration in water); The highest detectable concentration: 640,000mg/L (concentration of oil in water); Repeatability: relative standard deviation RSD<0.6% (standard oil sample with a concentration of 20～80mg/mL); Detection limit: 0.05mg/L (3 times the standard deviation of 11 measurements of tetrachloroethylene blank solution); Linear correlation coefficient: R>0.999; Sample analysis time: about 30 seconds for full spectrum scan.
Introduction: PD-21A infrared spectrophotometer is mainly used in the measurement of oil content in surface water, groundwater, industrial wastewater, cooking fume, welding wire, welding rod, soil and solids.
