The detection limit
The detection limit of analysis in a given extent can be reliably detected from the sample and the minimum concentration of the test substance or the minimum. The so-called detection test is to specify that the judge determines that there is a concentration of the sample is higher than the blank pending substances. There are several provisions of the detection limit , are summarized as follows : 1. Provisions spectrophotometry after deduction of blank values ,adidas f50 adizero, the absorbance of 0.01 corresponding concentration values of the detection limit . (2) set forth by gas chromatography detector response signal to noise generated twice the amount of the value of the detection limit . Minimum detectable concentration refers to the minimum detectable amount and injection volume ( volume ) ratio . 3 ion selective electrode method provides a method for the straight portion of the standard curve of the extension cord and extension potential through blank concentration axis and parallel to the straight lines intersect , their intersection is the concentration corresponding to the detection limit . 4 . " Global Environment Monitoring System Water Detection Operations Guide " provides that , for a given confidence level of 95 %, the concentration of the sample with a measured value of a zero concentration samples measured values were significantly different , namely the detection limit (L ) . When n is greater than the number of blank determinations 20:00 : L = 4.6 σwb formula : σwb - Blank parallel determinations ( intra ) the standard deviation. Detection limit is the highest part of the calibration curve linear limit point ( inflection point ) corresponding to the concentration value. 5 ,f50 2013, also known as the detection limit. Refers to a method of assurance given probability (for example, 95% confidence level ) conditions, from the sample measured values of the test substances can be distinguished from zero with a minimum concentration or minimum. Determination of the detection limit requirements with different methods and different. International Union of Pure and Applied Chemistry (IUPAC) detection limit prescribed L = kSb / S,Nike Lunar VI Mens, where Sb is measured several times the standard deviation of the blank ; S method for the determination of the sensitivity ; k is determined according to a certain level of confidence factor .