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i P110SPHORUS, REACTIVE (cont'd) APPENDIX Lf Page 2 of 2 ]Procedure 1- Take a water sample by filling a clean sample cell to the 25 mark.See Note A. 2. Add the contents of ane PhosVera'3 Phosphate Reagent powder Pillow Ser Noce R. A blue color will develop if phosphate is present.Wait at land swirl to mix immedi velopment but not morn than 10 Ca.t two minutes for full col minutes before completing Steps 3 through 6. 3. Fill another sample cell to the 25 mark with or, water sample and place it into the cel]holder, the light shield,Insert the Phosphate(PhosVer 3 Method)Meter Scale(Cat.No.41786-00)into the l and adjust the Wavelength Dial to 700 nm. 4. Set the Mode Switch to LEFT SET and check the left set adjustment,If necessmy,adjust the LEl'f control to align the meter needle with the extreme left mark on the meter scale.arc. S. Set the Mode Switch to NORM andadjust the RIGHT SET controls for a meter reading of zero mg+ 6. Place the prepared sampic in the cell holder and close the light shield.Read the mg/L phosphate(F: see Note C. Notes A. Large amounts of turbidity may cause inconsistent results in the phosphate tests because the acid pre. in the powder pillow may dissolve some of the suspended panicles and because of variable desorptic orthophosphate.from the panicles.Forhighly rarbid orcolored-rmples it is recommended that anothr mL of the water sample be treated with the contents r'--ne ft,•ahsre Prrb>atmenl PowdrrPillosc, { No. 1x501-99,and used to zero the instrument in Step 3. R. The PhosVer.?PbosphateReagent may cause some turbidity depending on a large number offactors recommended that a reagent blank be determin ed by. Steps 1 and 3.The result is expressed as the mg/L rea�trblank apnd iss ubtract dre singdeminerfrom the re l s o' subsequent tests using that reagent lot. a C. Thc results can be expressed as mg/L phosphorus by dividing the final scale reading by 3 oras mg/Lph photos pentoxide(P.O.,)by multiplying the final reading by 0.75. D• The following do not interfere at or below the concentrations listed: E Copper 10 mg/L Iron SOmg/L Silica 50mg/L 1 Silicate 10mg/L 4 , Arsenate and hydrogen sulfide do interfere. E. The standard additions method check can be performed as follows: I. Strap the neck off a fresh Valtsenc'F'ArnPule Standard for Low Range Orthophosphate(Cat 1`F 171-10).Using the TenSene,Pipet,add 0.10 ml-of standard to the prepared sample measured ( Step 6 of the procedure. Y 2. Swirl the sample to mix and take a Trading after one minute. 3. Add two more 0.10 mL standard increments to the same sample,taking a trading after each.]ya f € 0.1 mL of standard should cause a 0.2-mg/L increase in the reading. r„ sf� �3 aj