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224801 Phosphorus, Orthophosphate (Reactive) Test Kit, Model PO-19A

224801 Hach

For orthophosphate determination in various water samples by Color Disc/Ascorbic acid method.

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Phosphorus, Orthophosphate (Reactive) Test Set measures orthophosphate in the range of 0 - 0.8 mg/L PO₄, 0 - 4 mg/L PO₄ and 0 - 40 mg/L PO₄ in water and other liquids. The set uses Color Disc/Ascorbic acid method. Model PO-19A can be used for 100 tests. The smallest increment is 0.02 PO₄.

PO-19A Test Set includes:

  • PhosVer® 3 Phosphate Reagent Powder Pillows (p/n 220999)
  • Phosphate Color Disc, 0–40 mg/L (p/n 9262100)
  • 29 mL Square Bottle, with 10, 15, 20 and 23-mL marks (p/n 232706)
  • Glass Dropper, 0.5- and 1.0-mL marks (p/n 1419705)
  • Color Comparator Box (p/n 173200)
  • 18 mm Glass Viewing Tubes (p/n 173006)
  • Long-path Adapter (p/n 2412200)
  • Stoppers for 18-mm Glass Tubes and AccuVac Ampuls (p/n 173106)
  • Pleated Filter Paper, 2-3 micron, 12.5 cm (p/n 189457)
  • 65 mm Poly Funnel (p/n 108367)
  • Filtration Aid Solution, 29-mL DB (p/n 104633)

Procedure for PO₄ determination

Before you start take into account the following:

  • Clean tubes and bottles with 6.0 N (1:1) hydrochloric acid solution and rinse with deionized water.
  • Use the value in the middle of the two segments if the color match is between two segments.
  • Samples containing turbidity must be filtered before analysis (see the instruction sheet - included with the kit).

Testing procedure

If your sample contains turbidity, filter it in accordance with the instructions. After that follow the below mentioned steps.

In order to perform orthophosphate determination in the range from 0 - 4 mg/L PO₄, remove the long-path adapter from the color comparator box (if installed). Fill two tubes to the 5 mL line with sample. Place the first tube into the left opening of the color comparator box. Pour the content of PhosVer 3 Phosphate Reagent Powder Pillow to the second tube. Stir the second tube until the blue color appears. After 1 minute, insert the second tube into the color comparator box, rotate the color disc to find the color match and read the value in the scale window. Divide the value by 10 to get the testing results in mg/L.

Refer to the manual for orthophosphate measurement procedure in the range of 0 - 0.8 mg/L PO₄ and 0 - 40 mg/L PO₄. 

Brand Hach
Parameter Orthophosphate
Measuring range 0 - 0.8 mg/L PO₄
Measuring range (2): 0 - 4 mg/L PO₄
Measuring range (3): 0 - 40 mg/L PO₄
Smallest Increments Steps 0.02
Method Color Disc/Ascorbic acid method
Model PO-19A
Number of tests 100 tests

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