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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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Journal ArticleDOI
TL;DR: In this paper, the authors discuss the potential of New Zealand kauri (Agathis australis) to define the structure of the 14C calibration curve using annually resolved tree rings and thereby provide an absolute measure of atmospheric 14C.
Abstract: It is well known that radiocarbon years do not directly equate to calendar time. As a result, considerable effort has been devoted to generating a decadally resolved calibration curve for the Holocene and latter part of the last termination. A calibration curve that can be unambiguously attributed to changes in atmospheric 14C content has not, however, been gen- erated beyond 26 kyr cal BP, despite the urgent need to rigorously test climatic, environmental, and archaeological models. Here, we discuss the potential of New Zealand kauri (Agathis australis) to define the structure of the 14C calibration curve using annually resolved tree rings and thereby provide an absolute measure of atmospheric 14C. We report bidecadally sam- pled 14C measurements obtained from a floating 1050-yr chronology, demonstrating repeatable 14C measurements near the present limits of the dating method. The results indicate that considerable scope exists for a high-resolution 14C calibration curve back through OIS-3 using subfossil wood from this source.

30 citations

Journal ArticleDOI
TL;DR: The performances of traditional laser-induced breakdown spectroscopy (LIBS) and LA-LIBS were compared by quantifying the total elemental concentration of potassium in highly heterogeneous solid samples, namely soils to produce a superior linear response different than the traditional LIBS scheme.
Abstract: The performances of traditional laser-induced breakdown spectroscopy (LIBS) and laser ablation-LIBS (LA-LIBS) were compared by quantifying the total elemental concentration of potassium in highly heterogeneous solid samples, namely soils. Calibration curves for a set of fifteen samples with a wide range of potassium concentrations were generated. The LA-LIBS approach produced a superior linear response different than the traditional LIBS scheme. The analytical response of LA-LIBS was tested with a large set of different soil samples for the quantification of the total concentration of Fe, Mn, Mg, Ca, Na, and K. Results showed an acceptable linear response for Ca, Fe, Mg, and K while poor signal responses were found for Na and Mn. Signs of remaining matrix effects for the LA-LIBS approach in the case of soil analysis were found and discussed. Finally, some improvements and possibilities for future studies toward quantitative soil analysis with the LA-LIBS technique are suggested.

30 citations

Journal ArticleDOI
TL;DR: In this article, a spark discharge system was coupled to laser-induced breakdown spectroscopy (SD-LIBS) to improve sensitivity in the determination of P in fertilizers.

30 citations

Journal ArticleDOI
01 Jan 1985-Catena
TL;DR: In this paper, a method is described for the field calibration of a recording turbidity meter using optical neutral density filters instead of Formazin standards to check instrumental consistency in the field.
Abstract: The methods in common use for collecting data on suspended solids concentrations in streamflow and for calculating total load are either inaccurate or unnecessarily expensive. Recording turbidity meters offer a potential solution to these problems when used in association with a calibration between suspended solids concentrations and turbidity. In this paper a method is described for the field calibration of a recording turbidity meter. Optical neutral density filters are used instead of Formazin standards to check instrumental consistency in the field. Calibration with suspended solids concentrations is carried out using an automatic sampler whose operation is recorded together with turbidity on a two track recorder. The calibration curve is a second order polynomial in which turbidity explains 97% of the variance in suspended solids concentration.

30 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023210
2022508
2021137
2020213
2019234
2018216