Pack Size: box of 100 strips & reagent
Hazard Class /UN Number: Not Restricted
Storage Temp: Room Temperature
Test sticks and reagents for the semi-quantitative determina-tion of ortho-phosphate (PO 4 3û ) in solutions
Gradation of scale: 0-3-10-25-50-100 mg/l PO 4 3- white to blue-green
Only ortho-phosphate is determined. Other phosphates, such as poly-, pyro-, and metaphosphates, have to be decomposed for the determination of total phosphates. Silica (SiO 2 ) contents above 10 mg/l react in the same way giving a blue coloration. Larger amounts of sulphide ions (S 2û ) cause a brown colour of the test field, smaller concentrations cause low results.
The following ions do not interfere:
< 1000 mg/l Ag + , Al 3+ , Cd 2+ , Co 2+ , Cr 3+ , Mg 2+ , Mn 2+ , NH 4 + , Ni 2+ , Zn 2+ , Cl û , F û , NO 3 û , SO 4 2û , citrate, oxalate, tartrate,
< 500 mg/l Ca 2+ , < 250 mg/l Pb 2+ , < 50 mg/l Cu 2+
< 25 mg/l Fe 3+ , 5 mg/l Fe 2+ , < 2 mg/l NO 2 û
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