Turbidity Test Kit

Figure 2-20. T u r b i d i t y T e s t K it

TM-5-6630-215-12 Alarm-Monitor Group (AMG) OA-9431/F88-9(V) CAGEC 97403 Manual
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WARNING TM 5-6630-215-12 i. Turbidity Test Kit (fig. 2-20). (1) Turbidity interferes with color analysis. This test is made by comparing the turbidity of measured amount of the sample being analyzed with an identical amount of turbidity-free water to which an accurately measured amount of standardized turbidity reagent has been added. The readings are made by looking down through the column of liquid. If turbidity is present, it will interfere with the passage of light through the column of liquid. Small amounts of turbidity will cause a “blurring” of the black dot in the bottom of the tube. Large amounts of turbidity may provide sufficient “cloudiness” so that it is not possible to see the black dot when looking down through the column. Any color that may be present in the sample should be disregarded. This determination is concerned only with the haziness or cloudy nature of the sample. Do not allow reagents to come in contact with skin or eyes. Do not ingest. Most chemical reagents are corrosive or poisonous. NOTE Store reagent in a cool, dark place away from direct sunlight. Shake reagent vigorously before using. (2) Turbidity Test Procedure. (a) Fill one turbidity tube to the 50 ml graduation (top line) with the water to be tested. If the black dot in the bottom of the tube is not visible when looking down through the column of liquid, pour out a sufficient amount of the test sample so the tube is filled to the 25 ml graduation (top line). Most determinations are made with a 50 ml sample. (b) Fill the second turbidity tube with an amount of turb- idity-free water that is equal to the amount of sample being measured (25 or 50 ml). See instructions for turbidity-free water which follows in para 2-22j. (c) Place the two tubes side-by-side and note the differnece of clarity. (d) Add 0.5 ml of the standard turbidity reagent to the “clear water” turbidity tube. Seal with thumb or other stopper, invert both tubes to get equal distribution of the turbid particles. Inspect as in step (a). If the turbidity in the sample being tested is greater than the turbidity in the treated mixture in the second turbidity tube, continue to add the standard turbidity reagent in increments of 0.5 ml 2-80

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