TM 5-6630-215-12g. If a second filling of the micro burette is necessary, as men-tioned above, make certain that the final result includes the value ofthe original divisions as well as the additional quantity added.For example, a color endpoint is reached at the 13.4 (two subdivisionsbelow the 13 line) mark on the second filling of the micro burette.The result is 13.4 plus 20 or a total of 33.4 divisions. This numberof divisions is then multiplied by the specific constant factor listedin each titrimetric procedure to yield the concentration of theparameter being tested.h.As soon as the specific color change is observed (endpoint),stop any further movement of the micro burette plunger.i. Read the result of the test at that point on the scale that isdirectly opposite the bottom of the plunger tip.j. If additional tests, using the same reagents, are to be per-formed, the burette is refilled to the zero graduation.If no addi-tional tests are to be made, the titration solution in the burette isdiscarded and the burette and titration vial are thoroughly rinsedwith demineralized water and returned to the kit.2-12.WASH BOTTLE WITH RESIN.The wash bottle contains mixed beddemineralize resin which will provide water of a purity beyond thatof ordinary distilled water.a.Refill the wash bottle with resin with the cleanest wateravailable.If the water is turbid filter with turbidity - free waterfilter equipment (para 2-21).b.The wash bottle with resin may be used until the resin changesfrom blue to yellow.On rare occasions, a raw water may carry ananaerobic bacteria which will grow in the resin and liberate a rottenodor.If this happens, the wash bottle with resin must be replaced.2-13.CONVERSION FACTORS.a.Hardness-Alkalinity Calcium Carbonate (CaCo3) (table 2-4).b.Oxygen, Dissolved.Table 2-5 lists the mg/l dissolved oxygenin water at saturation for various temperatures and atmosphericpressures.The table was formulated in a laboratory using pure water;thus the values given should be considered as only approximations whenestimating the desired oxygen content of a particular body of surfacewater.2-12
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