Nitrate Test Strips 3-90 ppm Reflectoquant 1 PK *Requires RQflex 2 EMD# 16950-1

Purchase Nitrate Test Strips 3-90 ppm Reflectoquant 1 PK *Requires RQflex 2 EMD# 16950-1

Nitrate Test Strips 3-90 ppm Reflectoquant   1 PK *Requires RQflex 2 EMD# 16950-1 MSDS (Material Safety Data Sheet)

Reflectoquant® Nitrate Test Strips

Purchase Nitrate Test Strips 3-90 ppm Reflectoquant 1 PK *Requires RQflex 2 EMD# 16950-1

  • Gallade Part#: 169951
  • Mfr Part#: 16995-1
  • Brand: EMD Chemicals EM Science
  • Container: 1 PK of 50 Strips

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  • Reflectoquant® Nitrate Test, Catalog No. 16995/1

    1. Method

    Nitrate is reduced to nitrite by a reduction agent. In the presence of an acidic buffer, this nitrate 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
    3 - 90mg/l NO3

    0.7 - 20.3mg/l N

    48.3 - 1.449 mmol/m3 NO3 or N
    50

    1) for conversion factors see section 8

    for measurement of concentrations > 90mg/l NO3 see section 6

    3. Applications

    Sample Material:

    Groundwater, wellwater and drinking water
    Spring water and mineral water
    Industrial water,wastewater, percolating water
    Water in aquariums
    Pressed plant and fruit juices
    Food, animal fodder
    Soils and fertilizers

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

    4. Influence of Foreign Substances

    This was checked - in the case of interfering ions up to concentrations of 1,000mg/l - in solutions containing 50mg/l and 0mg/l NO3. 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 Fe2+ 10 EDTA 1,000
    Ascorbate 1,000 Fe3+ 10 Anionic Surfactants2) 10
    BO33- 1,000 K+ 1,000 Cationic Surfactants3) 10
    Ca2+ 1,000 Mg2+ 1,000 Nonionic Surfactants4) 1,000
    Citrate 1,000 Mn2+ 1,000 H2O2 10
    Cl- 500 NO2- 0.51) Na2SO4 1%
    CO32- 1,000 Oxalate 1,000  
    Cr3+ 100 PO43- 1,000  
    CrO42- 10 SO32- 10  
    Cu2+ 1 Tartrate 1,000  

    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

    Universal indicator strips pH 0-14. Cat. No 9590

    Amidosulfonic acid GR Cat. No.SX1140

    EM Quant® Nitrate Test, Cat. No. 10020 or 10050, measuring range 10-500 mg/l NO3

    Sodium acetate GR, Cat. No.SX0255

    Tartaric acid GR, Cat. No. TX0010

    Nitrate standard solution ready for use, 1,000 mg/l NO3, Cat. No. 19811

    6. Preparation

    • Extract solid sample materials by an appropriate method.
    • If nitrite is suspected, check the nitrite content using the EM Quant® Nitrite Test.

    If necessary eliminate interfering nitrite ions:

    To 5ml of sample (pH <10) add 5 drops of a 10% aqueous amidosulfonic acid solution and shake several times.

    • Check whether the nitrate content is within the measuring range. Use the EM Quant® Nitrate Test as a guide. Samples containing more than 90 mg/l NO3 must be diluted with distilled water.
    • The pH must be within the range 1-12. Check with universal indicator strips. If pH is lower than 1, buffer with sodium acetate; if greater than 12, adjust to approx. 3-5 with tartaric acid.

    7. Procedure

    • Observe the instructions for the RQflex Reflectometer.

    The following applies to the Nitrate Test:

    Measurement procedure A. Stored reaction time: 60 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 nitrate 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 NO3 or N mg/l NO3 16.1
    mg/l N mg/l NO3 0.226
    mg/l NO3 mmol/m3 NO3 or N 0.0620
    mg/l NO3 mg/l N 4.43

    9. Method Control

    To check analytical test strips, equipment and procedure:

    Dilute nitrate standard solution to 30mg/l NO3 and analyze as described in section 7.

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