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: In this article, a transverse relaxation time (T2) distribution curve was constructed using low-field 1H NMR as a rapid noninvasive method to quantify the oil and water contents of oil sludge.
Abstract: Rapid, accurate measurement of the oil and water contents of oil sludge is vital to determine technological solutions for the treatment of that oil sludge. Low-field 1H NMR as a rapid noninvasive method was used in this study. Carr–Purcell–Meiboom–Gill (CPMG) experiments were conducted to construct the transverse relaxation time (T2) distribution curves. The instrument’s ability to quantify oil sludge’s water and oil contents was verified. MnCl2·4H2O was added to the oil sludge to separate the oil and water signals. For calibration curve construction, excellent results were achieved, with correlation coefficients of 0.9996 and 0.987 for regressions between the mass and the relative peak area in the T2 distribution curve for oil and water separately. Good correlation of R2 = 0.998 was achieved between low-field NMR and azeotropic distillation for both water and oil along with standard deviations of 2.67% and 2.61% for the calibration curve method, or standard deviations of 2.81% and 1.88% for water and oil...
28 citations
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TL;DR: In this article, a Tl-pyrrolidine-1-carbodithioate complex formed in a sample solution of pH 1.6 was extracted on fine particles of a cellulose nitrate resin dispersed in the sample solution.
Abstract: Thallium in natural water samples was determined by electrothermal atomic absorption spectrometry after 1000-fold enrichment by mini solid-phase extraction from a 100-mL sample solution. A Tl-pyrrolidine-1-carbodithioate complex formed in a sample solution of pH 1.6 was extracted on fine particles of a cellulose nitrate resin dispersed in the sample solution. The cellulose nitrate resin was then collected on a membrane filter (25 mmo) by filtration under suction using a glass funnel with an effective filtration area of 0.64 cm2. As a result, a circular thin layer of the resin phase with a diameter of 9 mm was obtained. Then the resin phase was carved out by an acrylate resin puncher with a 10-mmo hole to put it into a sample cup containing 100 µL of 10 mM HNO3 containing 0.5 mM NaCl. The resin phase was suspended in the solution by ultrasonication. 1000-fold enrichment was thus attained within 15 min, and the suspension was delivered to electrothermal atomic absorption spectrometry. The linear calibration graph was obtained in the range of 0–4 ng of Tl in 100 mL of a sample solution. The detection limit obtained by 3σ method was 0.19 ng. The proposed method was applied to the determination of Tl in natural water samples. The results showed the concentration of Tl in seawater was 12.1 ± 1.8 pg mL−1 for the calibration graph method and 12.6 ± 1.4 pg mL−1 for the standard addition method. A snowmelt sample contained 20.7 ± 1.0 pg mL−1 of Tl.
28 citations
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TL;DR: In this article, a new and highly sensitive analytical technique based on mechanical stir bar sorptive extraction followed by gas chromatography-flame ionization detector (MSBSE-GC-FID) for the simultaneous determination of five polycyclic aromatic hydrocarbons (PAHs) in water samples was developed.
28 citations
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TL;DR: In this paper, two optimality criteria are introduced to quantify a priori the quality of the inverse predictions provided by a given experimental design, i.e., the V-1 criterion is based on the integral of inverse prediction variance over the calibration domain and the G(1) criterion on its maximum value.
28 citations
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TL;DR: A new analytical method for the determination of uric acid by the perturbation of UA on the Belousov-Zhabotinsky oscillating reaction is proposed, based on the linear relationship between the changes in the oscillating period and the concentration of UA.
28 citations