Potassium Test Strips 250-1500 ppm EM Quant (1 PK of 100)

Purchase Potassium Test Strips 250-1500 ppm EM Quant (1 PK of 100)

Potassium Test Strips 250-1500 ppm EM Quant  (1 PK of 100) MSDS (Material Safety Data Sheet)

10042 EM Quant® Potassium Test

Purchase Potassium Test Strips 250-1500 ppm EM Quant (1 PK of 100)

  • Gallade Part#: 100421
  • Mfr Part#: 10042-1
  • Brand: EMD Chemicals EM Science
  • Container: 1 PK of 100 Strips
  • Merck Index: 13.4814
  • CAS Number: Solution

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  • EM Quant® Potassium Test, Catalog No. 10042

    Test strips and reagent for the detection and semi-quantitative determination of potassium ions

    General

    EM Quant® Potassium Test provides a rapid guide to the amount of potassium in drinking water, mineral water, process and waste waters, extracts of soil samples, wine, beer, fruit juice and other substances.

    The test has the particular advantage that potassium can still be determined semi-quantitatively even when 10 times the amount of sodium is present. Larger concentrations of sodium can be eliminated simply by precipitating with zinc uranyl acetate solution. Potassium can then be determined semi-quantitatively without interference.

    Principle of the Method

    In alkaline solution, dipicrylamine forms an orange colored complex with potassium ions which is fixed on the reaction zone by treating with nitric acid.

    Graduation

    0 - 250 - 450 - 700 - 1000 - 1500mg/l (ppm) K+

    Directions

    1. Stand the ignition tube in the well provided in the deep-drawn insert in the lower part of the box and introduce 10 drops of reagent.
    2. Dip the test strip in the sample solution for 1 second so that the reaction zone is properly wetted, then gently shake off excess liquid.
    3. Immerse the test strip in the prepared reagent solution for 1 minute.
    4. Remove the test strip, wiping the edge against the rim of the tube to remove excess liquid and compare the reaction zone with the color scale.

    Notes

    If the solution to be tested has a pH below 5, mix 5ml with a spatula-tipful of lead (II) carbonate GR - the pH should then be 5 - and subsequently add a spatula-tipful of cadmium powder. Allow to settle and then test for potassium as described.

    The reaction zone of the test strip is already deeply colored by the dipicrylamine reagent. The final color is only obtained after the color reaction is complete.

    If the concentration lies at or above the upper value of the color scale, the sample solution must be diluted to bring the concentration within the most sensitive range of the test. When calculating the concentration, however, the dilution factor must be taken into account.

    Storage

    This package should be stored cool (10-20°C) and dry. Reclose the tube immediately after removing the test strips required and screw the top onto the reagent bottle.

    Safety Precautions

    Keep the reagent (0.6% nitric acid) away from the skin. In the event of contact, rinse well immediately with plenty of water. Seek immediate medical attention if substance enters the eye.

    Influence of Anions

    The determination is not disturbed by less than

    1000mg/l BR, BrO–3, Cl, ClO–3, ClO–4, CN, F, [Fe(CN)6]3–/4–, I, IO–3, IO–4, Mo7O6–24, N–3, NO–2, CN, PO3–4, SCN, SeO2–3, SO2–3, S2O2–4, S2O2–5, S2O2–8, VO–3, WO2–4, acetate, ascorbate, citrate, oxalate, succinate or tartrate. MnO–4 interferes due to its intrinsic color. More than 20mg/l S2 produces a brownish-yellow color on the reaction zone. Interfering sulfite ions are removed with cadmium chloride in weakly acidic to neutral solution.

    Influence of Cations

    The determination is not disturbed by less than

    1000mg/l Ag+, Al3+, As3+, Au3+, Ba2+, Be2+, Bi3+, Ca2+, Cd2+, Cu2+, Ce3+/4+, Cr3+, Fe2+/3+, Mg2+, Mn2+, Na+, Sb3+, Sn2+, Sr2+, VO2+, Zn2+ or Zr4+

    A false positive reaction is given by more than 100mg/l Cs+, 200mg/l NH4+, 200mg/l Tl4+, 100mg/l Rb+.

    In the presence of more than 500mg/l Li+ or 3000mg/l Na+, the potassium concentrations detected are lower than actually present. More than 200mg/l Hg+ discolors the reaction zone green.

    Elimination of Interference

    Ca2+ : Precipitate with oxalic acid GR, neutralize the filtrate with the OH– form of the Amberlite® IRA-400 ion exchanger.

    Cu2+, Hg+: Shake the sample solution with cadmium powder GR.

    Mn2+: Alkalize the sample solution with lithium hydroxide and filter off the precipitate of manganese dioxide.

    NH4+, Tl+: Acidify the sample solution with hydrochloric acid, evaporate to dryness (in a fume cupboard) and take up the residue in water.

    Sodium ions will only interfere if a yellow precipitate is formed when 2ml sample solution, which is either neutral or acidified with acetic acid, is mixed with 2ml of the zinc uranyl acetate solution described below:

    Zinc Uranyl Acetate Solution

    Dissolve 9g uranyl acetate GR, 9g zinc acetate GR and 2ml glacial acetic acid GR in 65ml water.

    Removal of Sodium Ions

    Allow 5ml of sample solution to run slowly (at 1 drop per second) through an exchanger column packed with 1g of Amberlite® IR-120 cation exchanger. Wash out the sodium ions with 50ml of 0.12 mol/l HCl. Then wash the columns with 5ml of 0.5 mol/l Hcl, neutralize the eluate with 1g of Amberlite® IR-400 anion exchanger loaded with OH ions, wait until the first few drops have passed through, and test for potassium with a test strip.

    Standard (1000mg/l)

    Potassium standard solution, 500ml.

    Package Size

    10042 EM Quant® Test strips and reagent Potassium Test for 100 determinations

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