Laserfiche WebLink
Ji r' Section'No 14 <br /> aRevision No 0' <br /> Date ' September 5, 1941 <br /> Page 1 of 4 <br /> 14 0 DATA MANAGEMENT PROCEDURES t <br /> e ' <br /> As part of the QA Project Plan, routine procedures' will be used to <br /> assess the precision, 'accuracy, and completeness of data for every <br /> measurement parameter "In 'addition, ' an extensive;, review" of field and, <br /> 1 ' ' + 1 I 1 N <br /> 'analytical=data will-be�conductedto ensure4;that�quality,control criteria <br /> �I I <br /> have been met Data assessment procedures to,evaluate accuracy, precision, <br /> and completeness'of laboratory data' ,are ldes6ribed I in the following sections <br /> 14 1 ' Accuracy <br /> Accuracy" is defined as the percent 'recovery ' for a spiked sample A <br /> 'sample` spike' is prepared by adding,a knownlamount of a pure compound, to �the <br /> f i ! ' ' " % i I r I i , ' �4 <br /> environmental sample ,The ,compound added is the same 'as, that being assayed <br /> I <br /> - ... � ... ��11_.? -.—«- y i-:- ='�' _. «, w � ... .s'.. ..._.3'n m -....:'' L S 111..', ....n .. ♦�-. ��.1..' <br /> ' for in the environmental sample , These spikes simulate them background and <br /> interferences found in the actual samples', the calctalated percent recovery of ' <br /> the spike is taken as a measure of the accuracy of the total analytical <br /> method When there is no,change in volume due to the spike', it is calculated <br /> 1, 1 $ <br /> as ,follows , <br /> I i <br /> P — (D-X) 100 Percent'Recovery <br /> (T-X) <br /> where <br /> , <br /> X � Measured value of analyte concentration in the sample before the <br /> spike was added <br /> D = Measured value of analyte concentration iii the sample after the <br /> spike is added <br /> T — Assumed true value of analyte concentration in the sample after the ' <br /> spike is added <br /> 14-1 <br />