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Preparing test standards


 Test #Parameter Test Standard  Standard Dilution step 1 Dilution step 2
 1Nitrate 30 ppm  1,000 ppm nitrate (4.430 ppm as NO3)   Dilute to 30 ppm:

68 uL in 10 mL
(34 uL in 5 mL)
 2     Nitrite 1 ppm  1,000 ppm nitrite (3,280 ppm as NO2) Dilute to a 100 ppm NO2 working stock:

305 uL in 10 mL
 Dilute to 1 ppm:

100 uL in 10 mL
 3 Ammonia2 ppm  1,000 ppm nitrate (1,220 ppm as NH3)  Dilute to a 100 ppm NH3 working stock:

820 uL in 10 mL
 Dilute to 2 ppm:

200 uL in 10 mL
 4 Phosphate 1 ppm 1,000 ppm PO4 (330 ppm P) Phosphate Dilute to a 10 ppm P working stock:

303 uL in 10 mL
 Dilute to 1 ppm:

1 mL in 10 mL
 5 Potassium 12.5 ppm 1,000 ppm potassium   Dilute to 12.5 ppm:

62.5 uL in 10 mL
 6Sulfate  150 ppm 1,000 ppm sulfate  Dilute to 150 ppm:

1.5 mL in 10 mL



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