Nitrite Test Strips 0.5-25.0 ppm Reflectoquant 50 PK *Requires RQflex 2 EMD# 16950-1

Purchase Nitrite Test Strips 0.5-25.0 ppm Reflectoquant 50 PK *Requires RQflex 2 EMD# 16950-1

Nitrite Test Strips 0.5-25.0 ppm Reflectoquant   50 PK *Requires RQflex 2 EMD# 16950-1 MSDS (Material Safety Data Sheet)

Reflectoquant® Nitrite Test Strips

Purchase Nitrite Test Strips 0.5-25.0 ppm Reflectoquant 50 PK *Requires RQflex 2 EMD# 16950-1

  • Gallade Part#: 169731
  • Mfr Part#: 16973-1
  • Brand: EMD Chemicals EM Science
  • Container: 1 PK of 50 Strips

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  • Reflectoquant® Nitrite Test Strips, Catalog No. 16973/1

    1. Method

    In the presence of an acidic buffer, nitrite reacts with an aromatic amine to form a diazonium salt, which in turn reacts with N-(1-naphthyl)-ethylenediamine to form a red-violet azo dye, the concentration of which is determined reflectometrically.

    2. Measuring Range and Number of Determinations

    Measuring Range1) Number of Determinations
    0.5 - 25.0 mg/l NO2-

    0.2 - 7.6 mg/l N

    10.9 - 542 mmol/m3 NO2- or N
    50

    1) for conversion factors see section 8

    for measurement of concentrations > 25 mg/l NO2see section 6

    3. Applications

    This test is only conditionally suited for the determination of the nitrite content of seawater samples (false-low readings).

    Sample material:

    Industrial water

    Wastewater

    Water in aquariums

    Food

    Cooling lubricants

    4. Influence of Foreign Substances

    This was checked - in the case of interfering ions up to concentrations of 1,000 mg/l - in solutions containing 10 mg/l NO2. 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 %

    Al3+ 1,000
    Ascorbate 100
    BO33- 1,000
    Ca2+ 1,000
    Citrate 1,000
    Cl- 100
    CO32- 1,000
    Cr3+ 100
    CrO42- 10
    Cu2+ 1,000
    Fe2+ 100
    Fe3+ 100
    K+ 1,000
    Mg2+ 1,000
    Mn2+ 100
    NO2- 1,000
    Oxalate 1,000
    PO43- 1,000
    SO32- 100
    Tartrate 1,000
    EDTA 1,000
    Anionic Surfactants2) 100
    Cationic Surfactants3) 1,000
    Nonionic Surfactants4) 1,000
    H2O2 100
    Na2SO4 20%

    1)In cases in which the nitrite concentration is higher, eliminate nitrite ions acc. to section 6

    2)tested with Na-dodecyl sulfate

    3)tested with N-cetylpyridinium chloride

    4)tested with polyvinylpyrrolidone

    5. Reagents and auxiliaries

    Store originally sealed pack in refrigerator. Opened pack: store closed tube outside refrigerator in a cool and dry place. The analytic test strips are stable at least up to the date stated on the pack when stored in these conditions.

    Package contents:

    Tube containing 50 analytical test strips

    Bar code strip

    Other reagents:

    EM Quant® Nitrite Test, Cat. No. 10007, measuring range 2-80 mg/l NO2
    colorpHast® Universal indicator strips pH 0-14. Cat. No 9590
    Sodium acetate GR, Cat. No.SX0255
    Tartaric acid GR, Cat. No. TX0010
    Nitrite standard solution ready for use, 1,000 mg/l NO2, Cat. No. 19899

    6. Preparation

    · Check whether the nitrite content is within the measuring range. Use the EM Quant® Nitrite Test as a guide. Samples containing more than 25.0 mg/l NO2 must be diluted with distilled water.

    · The pH must be within the range 1-13. Check with universal indicator strips. If pH is lower than 1, buffer with sodium acetate; if greater than 13, adjust to approx. 3-5 with tartaric acid.

    7. Procedure

    · Observe the instructions for the RQflex Reflectometer.

    The following applies to the Nitrite Test:

    Measurement procedure A. Stored reaction time: 15 sec.

    • Remove 1 analytical test strip and immediately reclose the tube.
    • Press START button of the reflectometer and at the same time immerse both reaction zones of the test strip in the sample solution (15-30°C) for approx. 2 sec.
    • Shake off excess liquid from the test strip
    • As soon as the beeper sounds (5 sec. before end of reaction time), insert the test strip all the way into the strip adapter with the reaction zones facing the display.
    • Read off the result from the display. The result is automatically stored.

    Note:

    • 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 nitrite concentration.
    • At the end of each workday, cleanse the strip adapter thoroughly with water or ethanol.

    8.Conversions

    units required= units given x conversion factor
    mmol/m3 NO2- mg/l NO2- 21.7
    mg/l N mmol/m3 NO3- or n 0.304
    mg/l NO2- mg/l N 3.28

    9. Method control

    To check analytical test strips, equipment and procedure:

    Dilute nitrite standard solution to 10 mg/l NO2 and analyze as described in section 7.

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