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P-C-111C <br /> 4.5.6. 1 .4 Analysis of sample. With the gas chromatograph set at 60°C. , <br /> inject 50 microliters of the effluent from the ion exchange column and engage <br /> the programming mechanism immediately. After the air peak has been recorded, <br /> change the attenuation to a point of low sensitivity; after 3 minutes, reset <br /> the attenuator at the 2 millivolt position. After 4 more minutes, adjust the <br /> base line to zero and allow the chromatogram to develop completely, adhering <br /> to the operating conditions described in 4.5.6. 1 .3. <br /> Establish detector response correction factors by calibrating with known <br /> weights of glycol ethers alid the internal standard. The following relative <br /> retention times are given only as a guide and for information: Ethylene <br /> glycol methyl ether-0.66; ethylene glycol monoethyl ether-0-71 ; ethylene <br /> glycol ethyl ether acetate-1 .0; ethylene glycol monobutyl ether—1 . 10; di- <br /> ethylene glycol diethyl ether-1 -30; diethylene glycol methyl ether—1 .86; <br /> di-ethylene glycol monobutyl ether-2. 16. <br /> Calculation: <br /> (1) Percent EGMBE = A x W x 20 <br /> S x 0.903 <br /> (2) Percent DEDE = B x W x 20 <br /> S x 0.907 <br /> (3) Percent DGMBE = C x W x 20 <br /> S x 0.955 <br /> EGMBE - Ethylene glycol monobutyl ether <br /> DEDE - Diethylene glycol diethyl ether <br /> DGMBE - Diethylene glycol monobutyl ether <br /> A - Corrected area of EGMBE peak <br /> B - Corrected area of DEDE peak <br /> C - Corrected area of DGMBE peak <br /> S - Area of internal standard peak <br /> W - Weight of internal standard, ethylene glycol monoethyl ether acetate <br /> The chromatogram shall be examined to determine absence of ethylene glycol <br /> monoethyl ether. <br /> 13 <br />