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02~25i94 15:27 E 702 356 8917 McClelland Lab <br />• 7) Add 24m1 of 30% 11202 (no stabilizers) and hcai beaker on a trot plate to 40°C. <br /> Remove beaker (mm hot plate and allow reaction to go to completion as indicated <br /> when bubbling ceases. Note: 'Three blanks (or each batch of samples should be <br /> treuted in nn identical manner. <br /> Caution: The Inltiel oxidrtion reaction may be quite violent (turbulent) when the <br /> temple rnntaina more than 0.146 sulfide sull4t' (pyrite). <br />t+) Add an additional )2m1 of 309'o H2O2 (no stabilizers) to beaker and allow reaction <br /> to go to completion (bubbling ceases). <br />y) Place beaker ott hot pla[c and heat to 90 to 95°C (solution temperature) until any <br /> unreacteJ HZUZ is destroyed, as indicated when bubbling ceases. <br />JO) Wash dnwtt the sides of rite beaker with 1).I. H2O an(I bring volume of total <br /> solution to IOOnt1. <br />11) Place beaker nn the lint plate and boil to drive off atry dissolved CU2, then cool to <br /> room temperature. <br />12) 'l~itrate the solution with standardized 0.07 N NaUll (fret of CUZ) to a pH of 7.0 <br /> using a pH meter. Pnriuct the sample from the aLUOSphere during titration su COZ <br /> is nM absorbed into the solution. <br />C:dculations <br />1) mey H' per 700g = (m! NaUH) x (1~ NaOH) x (lOUg =weight of sample) <br />2) % 5" = O.O1k5 (mcq H' /]OOg) - O.OSOti <br />3) % S° x 31.25 =tuns C:aC03eq/1t100 tons of waste rock <br />4) ANY, NNY, ratio calculations are the same as the other 2 methods. <br /> Note: In this case the AGIa is based on the readily oxidizable sulfide sulfur content <br />• of the waste rock. <br />Several summary (review) l)ages arc attacltcd for ready reference. <br />I4 <br />• Mrl'L1?LI.7W1) I.AR(.)R:1'It)Rl7?3, lN('. <br />