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PARTIG7E SI7.E ANALYSIS - HYLIRQ"~'TER MEI7-lOD <br />(A.S.A Agronomy ~:9 pp. 545 - 66.) <br />RFAGIIJfS: <br />Ca1Ron Solution, 'i/>: Dissolve 100g of Sodiisn Hexametaphospate <br />(Calgm) to a 1 liter volume. '~ <br />PROCID[7RE: <br />1. Weigh 40.0 p~ of sample into a French bottle. <br />2. Add 50.0 ml of Calgon Solution to the bottle. <br />3. Fill the bottle 2/3 full with deionized water, cap and place on shaker <br />far 16 bass. Prepare a blank by adding 50.0 ml of Calgon Solution to <br />an empty bottle and filling it 2/3 full with deionized water. (shaker <br />speed 120 exct¢gion per minute.) <br />4. After shaking, transfer the suspension to a suspension cylinder <br />quantitatively, and add deiauzed water to raise the volume of suspen- <br />sion to 1 litEx. <br />5. Insert the plunger, and move it up and down to mix the contents <br />thoroughly, (Caution: hold the cylinder firmly in place with the <br />free hand when the plunger is pulled upward.) Move the plunger <br />cautiousl near the top of the suspension during both the upstroke <br />and downstroke to avoid spilling, the contents. Use strong upward <br />strokes of the plunger near the bottom to lift into suspension any <br />particles that may have lodged there. Dislodge any sediment that <br />remains in the lower corners by inclinin~o the rod slightly and rotating <br />it to impart a spinning motion to the disk. Finish with two or three <br />slow, smooth strokes, and remove the plunger, tipping it slightly to <br />remove adhering drops. Record the time immediately. <br />6. Carefully place the hydr®eter in the suspension, record reading of <br />hydr®eter (R) and temperature (T) of suspaisicm at 30 and 60 seconds " <br />after T~~YI 9, then res~ove and rinse hydrometer. Note before trying to <br />read the hydrometer, if foam is present, add 2 drops of n-amyl alcohol. <br />7. Insert hydrometer into suspension and take a reading at 3 minutes after <br />mixing. Record the teBperattse and remove and rinse the hydrometer. <br />8. Repeat step 7 and take hydrometer and temg~erature readings at 10 min, <br />30, min, 90 min and 480 min. after the mixing. <br />C4I~ULATIGNS: <br />Rc =Corrected hydrometer rPa~i r (g/1) <br />Rs =Hydrometer reading of sample corrected for temperature <br />Rg =Hydrometer reading of blank corrected far temperattre <br />T =Temperature <br />t =Time, in minutes <br />8 = Sedinaartation Parameter obtained from table 43-7 of A.S.A. Argonomy <br />~p9 p. 564. using Rs <br />P = lrercent of Sample in suspension at its reading. <br />M =Oven dry weight of 1 gram of sample. (Moisture Value) <br />S =Particle Size <br />Rc = Rs-~ <br />P= Rc x 1/40g x 1/M x 100 <br />= Rc x 2.5/M <br />S = 8 / ~/ t <br />// <br />6-45 <br />