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Nj� 4 uuu �v 7.1.3 Dry waste samples amenable to grinding; Grind of otherwise subdivide the waste so that it: either pa::sa!, through a 1-mm sieve or can be extruded through a 1-mon hole, Introduce sufficient sample into thcl grindirip, apparatus to yield at least. 10 g after grinding. 7,2 Determination of erUnt moisture: In certain eases, sample results are desired based on a dry-weight basis. Whon such data is desired, a portion of sample for moisture determination should be weighed out at the same time as the portion used for analytical detergtination. 7.2.1 Immediately after w-I ghing the sample for extraction, weight 5-10 g of I :z sample into a tared crucible, Determine the percent moisture by drying overnight at 105°C. Allow to cool in a desiccator before weighing. P. of !-.ample= of dr sam le x100, 4 moisture g of sample 7.3 Determination Of 12H (if required': Transfer 5o g of sample to a 100-mL beaker. Add 50 mL of water and stir for 1 hr. Determine the pli of sample with glass electrode and pH mete• while stirring. Discard this portion of sample. 7.4 Extraction method far sam les expected to contain lots concentrations of organics and pesticides [20 mg/kg): 7.4.1 The following step should be performed rapidly to avoid loss of the more volatile exLractables. Weight approximately 30 g of sample into a 400-mL beaker. Record the weight to the nearest 0.1 g. Mon-porous or wet samples (gummy or clay type) that do not have a free-flowing sandy texture must be mixed with 60 g of anhydrous sodium sulfate using a spatula The sample should be free-flowing at this point. (r.id 1 mL of surrogate standards to all samples, spikes, and blanks (see Method 3500 for details on the surrogate standard solution and the matrix spike solution). For ;he sample in each analytical batch selected for spiking, add 1.0 mI. of the matrix spiking standard. For base/neutral- acid analysis, the amount added of the surrogates and matrix spiking compounds should result in a final concentration of 100 ng/uL of each acid analyte in the extract to be analyzed (assuming a 1 uL injection) . If Method 3640, Gel-permeation cleanup, is to be used, add twice the volume of surrogates and matrix spiking compounds since half of the extract is lost due to loading of the GPC column. Immediately add 100 mL of 1:1 methylene chloride:acetone. 7,4,2 place the bottom surface of the tip of the X207 3/4 in. disruptor horn about 1/2 in. below the surface of the solvent, but above the sediment layer.