Laserfiche WebLink
,, <br />• <br />Vol. <br />Rcy. <br />Measurement (ml) <br />-13- <br /> <br />Cunlaincr~:~ I'tcxxrva)ivc <br />Holding <br />„+ <br />"fine <br />NTA 50 I',G Cnul, a'C 2A Ilrs. <br />Mnrc specific inslructious fur prescn;+linn and sampling arc found wuh each pmccdurc as <br />dclailcd in this neu+ual. A gcncr+l discussion on sampling wailer and industrial watilcw;ucr may <br />be found in ASTM, Part 31, p. 72-82 (1976) Method U-3.170. <br />;'1 <br />2. Plastic (1') or Glass (G). For metals, polyethylene cvilh a polypropylene cap (no liner) is <br />preferred. <br />3. It should be pointed out Ihal holding limes listed above arr reconunendcd fur properly <br />preserved samples based nn currently available data ft is recognized ilcu for some s;unplc <br />types, extension of Ihesc limes may he possible while fur other types, these limes may be loo <br />long. Where shipping regulatinnc prevent the use of the proper presen~atiun technique or the <br />holding time is exceeded, such ac the case nl a 2d-hour comprnile, the final rcporlcd data for <br />these samples should indicate the spccillc v;iriancc. <br />O if the sample is slahihred by cooking, h should he cvanncd u+ 25"C for rcadmg, ur Icmperawrc <br />correction made and results rcporlcd at 25°C. <br />5. Whcrc IINO, cannot be used brcausc of slul,ping rc~lriclious, the s;unplc nciy be initially <br />preserved by icing and inunali;ucly shipped to the laboratory. Upon receipt in the laboratory, <br />the sample mull be acidilicd to a pll r2 wit6 IINO, (normally 3 ml I:I IINO,/tiler is <br />sufficient). Al the time of analysis, the sample comainer should be Thoroughly rinsed with I:I <br />I INO, and the svnshings added Io the sample (volume cnrreclion may be rcymred). <br />6. Data obtained from National Cnforccmcnl InaesliCalmns Cl'nll'r-Denver, COlOfad0, support a <br />four-week holding lime for Ibis parameter iu Sewrrage Syslcnx. (SIC 4952). <br />xis <br /> <br />