Minimum Detection Limit

2016 ◽  
Author(s):  
Jack G. Calvert
Keyword(s):  
Detection Limit ◽  
Minimum Detection Limit

Low-power total reflection X-ray fluorescence spectrometer using diffractometer guide rail

2014 ◽  
Vol 30 (1) ◽  
pp. 36-39
Author(s):  
Ying Liu ◽  
Susumu Imashuku ◽  
Jun Kawai
Keyword(s):  
Detection Limit ◽  
Low Power ◽  
Power Supply ◽  
Total Reflection ◽  
Minimum Detection Limit ◽  
Guide Rail ◽  
X Ray ◽  
Fluorescence Spectrometer

An X-ray diffractometer (XRD) was modified to a low-power total reflection X-ray fluorescence (TXRF) spectrometer. This was realized by reducing the XRD tube power (3 kW) down to 10 W by a Spellman power supply. The present spectrometer consisted of a waveguide slit, Si-PIN detector, a goniometer and two Z-axis stages that were set on a diffractometer guide rail. This unit was easy in assembly. The first measurements with this spectrometer were presented. The minimum detection limit for Cr was estimated to be a few nanograms or at the level of 1013 atoms cm−2.

Trace Analysis Using EDS: Applications to Thin-Film and Heterogeneous Samples

1990 ◽  
Vol 34 ◽  
pp. 57-70 ◽  
Author(s):  
B. J. Cross ◽  
J. E. Augenstine
Keyword(s):  
Thin Film ◽  
Detection Limit ◽  
Trace Analysis ◽  
Chemical Component ◽  
Minimum Detection Limit ◽  
False Detection ◽  
Heterogeneous Samples ◽  
Analysis Measurement ◽  
Detection And Quantification

Critical to “Trace Analysis” measurement are the concepts of detection and quantification. Detection means positively identifying a chemical component. The term Minimum Detection Limit (MDL), used here, follows that of Currie, and is the smallest concentration that yields a net count, above system background, which will be detected with a 95% probability (with only a 5% probability of false detection).

scholarly journals A Study on Prevalence of Escherichia coli O157 with a Verified Method in Foods

2017 ◽  
Vol 5 (4) ◽  
pp. 294 ◽  
Author(s):  
Semiha Yalçın ◽  
Ayla Ünver Alçay ◽  
Gözde Yüzbaşıoğlu ◽  
Burcu Çakmak ◽  
Aysun Sağlam
Keyword(s):  
Escherichia Coli ◽  
Detection Limit ◽  
Standard Method ◽  
False Positive ◽  
Detection Method ◽  
Minimum Detection Limit ◽  
Escherichia Coli O157 ◽  
E Coli

The purpose of this study were to identify the presence of E.coli O157 and to determine its prevalence in foods which were collected from various restaurants, shops and markets in Istanbul. Also, validation of detection method of E. coli O157 in all food stuffs was carried out according to applicability, repeatability, and minimum detection limit (LOD) and false positive and negative analysis based on TS EN ISO 16654 standard method. The results showed that the prevalence of E. coli O157 in food was 2%, and its prevalence increased in April and May.

scholarly journals Estimation of minimum detection limit in synchrotron radiation X-ray fluorescence analysis.

1984 ◽  
Vol 33 (12) ◽  
pp. E543-E545 ◽  
Author(s):  
Hiroki YONEZAWA ◽  
Kenji KOBAYASHI ◽  
Atsuo IIDA ◽  
Yohichi GOHSHI
Keyword(s):  
Detection Limit ◽  
Synchrotron Radiation ◽  
Fluorescence Analysis ◽  
Minimum Detection Limit ◽  
X Ray

How sensitive are immunometric assays for thyrotropin?

1989 ◽  
Vol 35 (2) ◽  
pp. 289-291 ◽  
Author(s):  
M G McConway ◽  
R S Chapman ◽  
G H Beastall ◽  
E Brown ◽  
J Tillman ◽  
...  
Keyword(s):  
Detection Limit ◽  
Usual Method ◽  
Minimum Detection Limit ◽  
Response Variable ◽  
Response Data ◽  
Assay Performance ◽  
Valid Estimate ◽  
Serum Response ◽  
Analytical Practice ◽  
Meaningful Measure

Abstract The usual method for calculation of the "sensitivity" of thyrotropin immunometric assays is multireplicate analysis of the zero analyte standard. Although this is a statistically valid estimate of the scatter likely to be found in the response variable, it is unrelated to normal analytical practice (usually analysis in duplicate) and estimates intra-assay errors only. This study was designed to assess the analytical performance of 10 immunometric assays used routinely for measurement of thyrotropin in human serum. Response data from each assay were accumulated to provide (a) an estimate of "sensitivity" from multireplicate analysis and (b) an estimate of "minimum detection limit," relating directly to errors associated with routine performance and derived from a minimum of 500 duplicate analyses. We conclude that the "minimum detection limit" should be promoted as a more meaningful measure of assay performance at low analyte concentrations than the "sensitivity" derived from multireplicate analysis of the zero-analyte standard.

A pyrenesulfonyl-imidazolium derivative as a selective cyanide ion sensor in aqueous media

2015 ◽  
Vol 39 (4) ◽  
pp. 2935-2942 ◽  
Author(s):  
Ashwani Kumar ◽  
Hong-Seok Kim
Keyword(s):  
Detection Limit ◽  
Aqueous Media ◽  
Minimum Detection Limit ◽  
Cyanide Ion ◽  
Ion Sensor

Unlocking of probe 2 with CN− ions leads to its minimum detection limit of 0.5 μM (13 ppb).

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