5 results about "Calibration curve" patented technology

As previous processing of measurement in which gas to be measured containing, as gas components, carbon dioxide ¹³CO₂ and carbon dioxide ¹²CO₂, is introduced into a cell, and in which the intensities of transmitted lights having wavelengths suitable for measurement of the respective gas components, are measured and then data-processed to measure the concentrations of the gas components, the air having a predetermined volume Va is sucked by a gas injection device 21, a gas exhaust valve V6 of a cell 11 is closed and the air stored in the gas injection device 21 is transferred to the cell 11 filled with the air at an atmospheric pressure, thereby to pressurize the cell inside. The pressure thus pressurized is measured as P. The cell volume Vc is subtracted from the product obtained by multiplying the sum. V0 of the volume Va and Vc the cell volume Vc, by the ratio P0/P in which P0 is the target pressure of the gas to be measured at which a calibration curve has been prepared for an isotope gas analysis and measurement, thus determining the one-time gas injection amount of the gas injection device 21. Thus, measured concentration variations based on changes in atmospheric pressure can be corrected.

The invention provides a method for detecting polar phenol type chlorinated/brominated disinfection by-products in water. The method comprises steps as follows: 1) standard working solutions of 13 polar phenol type chlorinated/brominated disinfection by-products required to be detected are prepared; 2) a to-be-detected water sample is acidized, salted out, subjected to continuous liquid-liquid extraction, separated, concentrated, filtered and pretreated in other modes; 3) analysis is performed by means of a UPLC/ESI-tqMS (ultra-high performance liquid chromatography/electrospray ionization-triple quadrupole mass spectrometer): mass spectrum parameters, liquid chromatography parameters and gradient elution process parameters of the UPLC/ESI-tqMS are established; 4) a calibration curve is drawn and the concentration is calculated after a chromatographic peak of a chromatogram sample is preliminarily determined to be identical to that of a known standard substance and the chromatogram sample and the known standard substance are the same substance. The detection method is high in sensitivity, precision and accuracy, can achieve the purpose of rapidly and efficiently measuring the 13 polar phenol type chlorinated/brominated disinfection by-products in the water, particularly can rapidly and efficiently detect a trace quantity of polar phenol type chlorinated/brominated disinfection by-products in the water, and has relatively high practical value.

The invention discloses a method for determining the calcium content in anthracite coal, which comprises: (1) grinding the anthracite sample to be tested to obtain anthracite powder; (2) mixing the anthracite powder with anhydrous sodium carbonate and sodium tetraborate according to a predetermined ratio , so as to obtain the mixture; (3) the mixture is placed in a platinum crucible and melted in a muffle furnace to obtain a molten product; (4) the molten product is transferred to a beaker with boiling hydrochloric acid for leaching to obtain (5) transfer the leaching solution to a volumetric flask for constant volume, so as to obtain the sample to be tested; (6) prepare the calcium working curve standard solution of a series of concentrations; Calcium working curve standard solution is used for detection, and the calcium content in anthracite is calculated according to the standard curve drawn from the detection results. The method is simple and easy to implement, and the calcium content in the anthracite can be quickly and accurately determined by using the method.