Topic
Calibration curve
About: Calibration curve is a research topic. Over the lifetime, 6552 publications have been published within this topic receiving 95128 citations.
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TL;DR: A selective, sensitive, rapid and reproducible high-performance liquid chromatographic method for the determination of terazosin in plasma is described and the structurally related compound prazosin was used as an internal standard.
26 citations
TL;DR: The structure of the sensing element of a gold-deposited optical fiber sensor was simplified and quantitative analyses of various alcohols with the sensor showed improvement of the performance.
Abstract: The structure of the sensing element of a gold-deposited optical fiber sensor was simplified and quantitative analyses of various alcohols with the sensor showed improvement of the performance. The sensor uses surface plasmon resonance (SPR) at the interface of a sample solution and a thin (10 - 70 nm) gold film deposited on half of the exposed core of the optical fiber. The sensor with a film thickness of 45 nm can detect a small change of 5.6 × 10-5 refractive index (RI) units in the refractivity. The response time is less than 0.5 min and the relative standard deviation for measurements is less than or equal to 1%. A straight line with a correlation coefficient of 0.9995 was obtained below 10%, v/v in the calibration curve for methanol solutions of benzyl alcohol. The minimum of the response curve due to the maximum excitation of SPR in the refractivity range from 1.33 to 1.44 RI units shifts to a lower refractivity as the film becomes thicker. The response curves of the sensors were calculated from SPR theoretical equations while considering of the distribution in the thickness of the deposited gold films. The improvement in the performance of the sensor is discussed.
26 citations
TL;DR: A long–short double pulse laser-induced breakdown spectroscopy method was employed to improve the analytical performance of LIBS for the measurement of manganese in steel samples, suggesting that the improvement in detection ability can be attributed to the pre-irradiation effect of long-pulse laser beam.
Abstract: A long-short double pulse laser-induced breakdown spectroscopy (long-short DP-LIBS) method was employed to improve the performance of LIBS for the measurement of manganese in steel samples The long pulse was generated by a Nd:YAG laser which was operated at free runing (FR) mode To investigate the detection ability without sample preparation, the steel washers were tested using SP-LIBS and long-short DP-LIBS, respectively The measurement results show that the long-short DP-LIBS method was able to record clear spectra from the rusty steel washers The steel washers were also measured after the polishing process The measurement results show that the signal intensity was enhanced by long-short DP-LIBS Through the observation with scanning electron microscope (SEM) on the laser craters, the results suggest that the improvement of detection ability can be attributed to the pre-radiation effect of long-pulse laser beam Next, the analytical performance for quantitative measurement of manganese was evaluated by employing ten standard steel samples The results show that the linearty fit (R2) of calibration curve is 0988 for long-short DP-LIBS, whereas, R2 is only 0810 for SP-LIBS under the same measurement conditions The five times repeated measurement results show that the average Relative Standard Deviation (RSD) of the tested samples is 293% for SP-LIBS and is 105% for long-short DP-LIBS The prediction results also show that the average Relative Error of Prediction (REP) is 949% for SP-LIBS and it 49% for long-short DP-LIBS The experimental results in current work demonstrate that long-short DP-LIBS is promising for the on line measurement of steel in the steelmaking plant
26 citations
TL;DR: In this paper, a theory of "corrected" fluorescent intensities free from matrix effects is put forward, which is quasi absolute, as only a few standard specimens are used, made up either of pure compounds or of a well known reference sample.
26 citations
Patent•
28 Aug 2001
TL;DR: In this paper, a method of building instrument variation tolerance into calibration algorithms for spectroscopic devices for chemical composition analysis with spectroscopy methods is presented. But the method is not suitable for blood glucose, cholesterol and other chemical components prediction based on near-infrared spectrophotometry measurements.
Abstract: The present invention relates to a method of building instrument variation tolerance into calibration algorithms for spectroscopic devices for chemical composition analysis with spectroscopic methods. The method of the present invention is particularly suitable for blood glucose, cholesterol and other chemical components prediction based on near-infrared spectrophotometry measurements. A method includes developing a calibration algorithm on a first instrument; applying the calibration algorithm to a second instrument; calibrating the second instrument and adjusting the calibration algorithm to account for differences between the first instrument and the second instrument; and repeating the step of applying (above) in respect of (n) further instruments to provide a calibration algorithm which may then be used on other instruments. Methods are also provided that develop calibration algorithms by adding instrument variations, based on mathematical manipulation, of the spectral data collected on calibration instruments.
26 citations