Zinc Test Strips 10-250 ppm EM Quant (1 PK of 100) HAZMAT fee incl

Purchase Zinc Test Strips 10-250 ppm EM Quant (1 PK of 100) HAZMAT fee incl

Zinc Test Strips 10-250 ppm EM Quant  (1 PK of 100) HAZMAT fee incl MSDS (Material Safety Data Sheet)

10038 EM Quant® Zinc Test

EM Quant® Zinc Test, Catalog No. 10038

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

General

The Zinc Test offers a rapid means of monitoring the quality and concentration of zinc and zinc compounds used in galvanizing plants, as mordant in the textile industry, as preservatives, as additives in glass, enamel and ceramic ware and also, because of its antiseptic properties, in cosmetic preparations.

Zinc is a trace element which plays a vital role in human, animal and plant organisms. Small quantities of zinc are found in many types of meats and vegetables, so that in humans, the daily requirement is adequately covered. Excessive concentrations of zinc, on the other hand, may cause sores, inflammation and vomiting. It has a noticeable metallic taste

Principle of the Method

The test is based on the formation of a red complex between dithizone and hydroxozincate ions. The notable advantage of this test lies in the fact that dithizone is incorporated into the reaction zone in a stable form. Since dithizone reacts with many other metal ions, sodium hydroxide solution is added to the sample solution prior to immersion of the strip, to precipitate out interfering ions and to convert Zn2+ into zincate. All heavy metals that react with dithizone are detected if the pH is less than 4.

Graduation

0 - 10 - 40 - 100 - 200 - 250mg/l (ppm) Zn2+

Directions

  1. Rinse the measuring vessel several times with some of the sample solution and fill to the 5ml mark.
  2. Add 10 drops of reagent (sodium hydroxide solution) and swirl carefully. Filter off any sediment which may form.
  3. Immerse the test strip in the solution for 1 second and remove excess liquid by stroking the edge of the strip against the rim of the vessel.
  4. Wait 15 seconds and compare the reaction zone with the color scale.

Notes

The reaction zone is red to start with. The final color appears when the reaction has taken place.

Adjust strongly acidic solutions (pH <1) to pH 2-4 with sodium hydroxide solution before testing as above.

Add only 5 drops of reagent if the pH of the solution is more than 8.

Safety Precautions

Keep the reagent (32% sodium hydroxide solution) away from the skin. In the event of contact, rinse 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 of each of the following: Br, BrO3–, Cl, ClO3–, CrO42–, F, [Fe(CN)6]3–/4–, I, IO3–, MO7O246–, N3–, NO2–, NO3–, OCN, PO43–, SO32–, SO42–, S2O32–, S2O42–, S2O52–, S2O82–, SeO32–, SCN, VO3–, WO42–, acetate, ascorbate, citrate, oxalate, succinate, tartrate.

In the presence of more than 200mg/l of CN, 25mg/l of IO4–, and of S2–, lower concentrations of Zn2+ than are actually present are indicated. More than 25mg/l of MnO4– interferes with the test by the production of a brown color.

Elimination of Interference

S2– and CN are removed by adjusting the solution to be tested to about pH 1 with 25% sulfuric acid and evaporating in a fume cupboard (Caution: hydrogen sulfide and/or hydrogen cyanide are formed).

MnO4– and IO4– are destroyed by adding a small spatula-tip of hydroxylammonium chloride to 5ml of the acidic solution (pH 0-4).

Interference of Cations

The determination is not disturbed by less than 1000mg/l of each of the following:Ag+, Al3+, As3+, Au3+, Ba2+, Be2+, Bi3+, Cd2+, Ce3+, Ce4+, Co2+, Fe2+, Fe3+, Mg2+, molybdenum blue, Pb2+, Rb+, Sb3+, Sn2+, Sn4+, Sr2+, Ti4+, VO2+, Zr4+.

In the presence of more than 500mg/l of Ca2+, NH4+, 100mg/l of Cr3+, Mg2+, Mn2+ and 25mg/l of Ni2+ lower concentrations of Zn2+(II) than are actually present are indicated. The reaction zone is colored brown by Cu2+, Tl+ and more than 5mg/l of Hg+/2+.

Elimination of Interference

Before carrying out the Zn2+ determination, remove the following cations from a weakly acidic solution by adding a spatula-tip of the specified precipitants to 5ml of the sample solution:

Cu2+ and Hg+/2+: Mix with iron or cadmium powder, shake for approximately 1 minute and filter.

Ca2+: Precipitate with oxalic acid and filter

Tl+: Mix with Kl, shake for approximately 1 minute and filter.

When Ni2+ is present (detected by Nickel Test) proceed as follows:

Add approximately 1ml of 1% alcoholic dimethylglyoxime solution to approximately 2ml of sample solution (pH 1-7). While shaking, add sodium acetate until no more red precipitate is formed, then filter. Destroy excess dimethylglyoxime by adding a spatula-tip of potassium cyanide and boiling (fume cupboard!). Add 2ml of 1 mol/l sulfuric acid and fume off (fume cupboard!). Add 2ml of water and test for Zn2+ as above.

NH4+ is driven off as ammonia gas by heating the alkaline solution.

Standard (1000mg/l)

Zinc standard solution, 500ml.

Package Size

10038 EM Quant® Test strips and reagent

Zinc Test for 100 determinations

Purchase Zinc Test Strips 10-250 ppm EM Quant (1 PK of 100) HAZMAT fee incl

  • Gallade Part#: 10038-1
  • Mfr Part#: 10038-1
  • Brand: EMD Chemicals EM Science
  • Container: 1 PK of 100 Strips
  • Misc: HAZMAT UN1824 PGII CORROSIVE
  • CAS Number: Mixture

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