Laserfiche WebLink
i <br /> <br /> <br />1 <br /> <br /> <br /> <br />LJ <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br />1 <br />~~,,. <br />Western Atlas <br />iRt6rR8t1~R8r <br />e,o... G..v~ <br />CORE LABORATORIES <br />r i l l E <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1106/92 77 of 104 <br />• Matrix spikes are not required for the majority of gravimetric parameters. <br />• For gravimetric sulfates, matrix spikes must be analyzed Ignce per batch or <br /> at a frequency of 10% of the sample population, whichever is greater. <br />Titrimetric Parameters <br />• Titrant normality must be verified initially by analyzing a known reference <br /> material lif available) or stock solution. <br />• Class A burets must be used for titrimetric parameters. <br />• At a minimum, buret readings should be recorded to 0.01 mL. Where <br /> necessary, more accurate micro-burets should be used. <br />• A method blank and reference standard or stock standard (ifi available) must <br /> be analyzed with each sample batch. <br />• Laboratory duplicates must be analyzed once per batch or at a frequency <br /> of 10% of the sample population, whichever is greater. <br />• Matrix spikes (where applicable) must be analyzed once per batch or at a <br /> frequency of 10% of the sample population, whichever is greater. <br />C olorimetric Parameters <br />• At a minimum, spectrophotometers must be calibrated orchecked annually. <br />• At a minimum, a 4-point calibration curve (blank and 3 standards) should <br /> be used for the majority or Colorimetric parameters. <br />• The correlation coefficient should be > 0.995 for the majority of <br /> Colorimetric parameters. <br />• Initial calibration blanks must be analyzed prior to field sample analysis. <br />• Continuing calibration blanks must be analyzed once per batch or at a <br /> frequency of 10% of the sample population, whichever is greater. ~ <br />r <br />