Potassium Test Strips 250-1200 ppm Reflectoquant 1 PK *Requires RQflex 2 EMD# 16950-1

Purchase Potassium Test Strips 250-1200 ppm Reflectoquant 1 PK *Requires RQflex 2 EMD# 16950-1

Potassium Test Strips 250-1200 ppm Reflectoquant   1 PK *Requires RQflex 2 EMD# 16950-1 MSDS (Material Safety Data Sheet)

Reflectoquant® Potassium Test Strips

Purchase Potassium Test Strips 250-1200 ppm Reflectoquant 1 PK *Requires RQflex 2 EMD# 16950-1

  • Gallade Part#: 16992-1
  • Mfr Part#: 16992-1
  • Brand: EMD Chemicals EM Science
  • Container: 1 PK of 50 Strips
  • CAS Number: Solution

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  • Reflectoquant® Potassium Test, Catalog No. 16992/1

    1. Method

    K+ ions react with dipicrylamine to form an orange-colored complex, the concentration of which is determined reflectometrically.

    2. Measuring Range and Number of Determinations

    Measuring range1) Number of Determinations
    0.25-1.2 g/l K+ 50

    1)for measurement of concentrations > 1.20 g/l K+ see section 6

    3. Applications

    Sample Material:

    Drinking water and mineral water
    Industrial water
    Wastewater
    Beverages
    Soils

    4. Influence of Foreign Substances

    This was checked - in the case of interfering ions up to concentrations of 1,000mg/l - in solutions containing 0.7 and 0 g/l K+. The concentrations of foreign substances given in the table lie below the limit at which the determination is interfered with:

    Concentrations of Foreign Substances in mg/l or %

    Acetate 1,000
    Ag+ 1,000
    Al3+ 1,000
    Ascorbate 1,000
    Br- 1,000
    Ca2+ 1,000
    Cd2+ 1,000
    Cl- 500
    CN- 1,000
    CO32- 1,000
    Cr3+ 1,000
    CrO42- 1,000
    Cu2+ 1,000
    Fe2+ 500
    Fe3+ 500
    Mg2+ 500
    Na+ 1,000
    NH4+ 200
    NO2- 1,000
    NO3- 1,000
    Oxalate 1,000
    Pb2+ 1,000
    PO43- 100
    S2- 100
    Tartrate 1,000
    EDTA 1,000
    Anionic Surfactants1) 1,000
    Cationic Surfactants2) 100
    Nonionic Surfactants3) 1,000
    H2O2 1,000

    1)tested with Na-dodecyl sulfate

    2)tested with N-cetylpyridinium chloride

    3)tested with polyvinylpyrrolidone

    5. Reagents and Auxiliaries

    The analytic test strips are stable at least up to the date stated on the pack when stored in the closed tube at +15 to +25°

    Package Contents:

    Tube containing 50 analytical test strips
    Bar code strip
    2 bottles of reagent K–1
    2 mini-test tubes

    Other Reagents:

    colorpHast® Universal indicator strips pH 0-14. Cat. No 9590
    EM Quant® Potassium Test, measuring range (0.25-1.5 g/l K+), Cat. No. 10042
    Calcium hydroxide GR, Cat. No.CX0220
    Titristar® Sulfuric acid 0.5mol/l Cat. No. SX1243K
    CertiPUR® Potassium standard solution 1,000mg/l, Cat. No. 1.70230

    6. Preparation

    • Check whether the potassium content is within the measuring range. Use the EM Quant® Potassium Test as a guide. Samples containing more than 1.20 g/l K+ must be diluted with distilled water.
    • · The pH must be within the range 5-14. Check with universal indicator strips. If pH is lower than 5, buffer with calcium hydroxide.

    7. Procedure

    • Observe the instructions for the RQflex Reflectometer.

    The following applies to the Potassium Test:

    Measurement Procedure B

    Stored waiting time: 60 sec.

    Stored reaction time: 5 sec.

    • Stand 1 mini-test tube in the well provided in the deep-drawn insert and introduce 25 drops of reagent K–1.
    • Remove 1 analytical test strip and immediately reclose the tube.
    • Immerse both reaction zones of the test strip in the pretreated sample solution (15-30°C) for approx. 2 sec.
    • Vigorously shake off excess liquid from the test strip
    • Press START button of the reflectometer and -- this is imperative -- at the same time place the test strip in the minitube containing the reagent.
    • After the end of the waiting time, immediately remove the test strip from the minitube and shake off excess liquid vigorously

    The reaction time is shown on the display.

    • Insert the test strip all the way into the strip adapter with the reaction zones facing the display and press START button of the reflectometer.
    • Read off the result from the display in g/l K+. The result is automatically stored.

    Note:

    • The reagent in the mini-test tube can be used up to a maximum if five times.
    • If the test strip is inserted into the adapter after the reaction time has expired, renewed depression of the START button will result in a false-high reading of the potassium concentration.
    • At the end of each workday, cleanse the strip adapter thoroughly with water or ethanol.

    8. Method Control

    To check analytical test strips, equipment and procedure:

    Dilute potassium standard solution to .5 g/l K+ and analyze as described in section 7.

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