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Lead Test Strips 20-500 ppm EM Quant (1 PK of 100)

100771
$211.40
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Lead Test Strips 20-500 ppm EM Quant  (1 PK of 100) MAIN
MSDS (Material Safety Data Sheet)

EM Quant® Lead Test, Catalog No. 10077

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

General

The EM Quant® Lead Test strips are ideal for the semi-quantitative determination of lead ions in solutions and for detecting metallic lead and compounds on surfaces.

Despite being highly toxic (lead poisoning=the accumulation of lead in the body through inhalation and absorption of lead vapors and dust), lead is used for many purposes such as cable sheathing, for protecting against Xray and gamma radiation, in batteries, for manufacturing tubes and containers, in paints (red lead) and as a petroleum additive (in the form of tetraethyllead), to prevent engine knocking. It continues to be used because it is versatile, easy to work (soft and malleable) and resistant to corrosive liquids.

Lead found in our environment (water, soil, the food chain) can mostly be traced back to vehicle exhausts and the combustion of leaded gasoline. The combustion process yields lead and lead oxide. Most of the substances are discharged directly into the atmosphere, but small amounts are deposited in the exhaust pipe. It is thus possible to tell whether or not a vehicle has been run on leaded gasoline.

An interesting application is the testing of catalytic converters. These become "poisoned" through the occasional, inadvertent use of leaded gasoline, so allowing high concentrations of NO2 compounds to enter the atmosphere through vehicle exhausts.

Please note that the EM Quant® Lead Test only detects ionic lead. It will not respond to organic compounds such as tetraethyllead in gasoline.

Principle of the Method

Lead reacts with rodizonic acid in an acidic solution to form a red complex.

Graduation

0 - 20 - 40 - 100 - 200 - 500 mg/l (ppm) Pb2+

Directions

In aqueous solutions:

  1. Rinse the measuring vessel with some of the sample and fill to the 5 ml mark.
  2. Add 3 drops of reagent (acetic acid) and swirl cautiously.
  3. Immerse the test strip in the solution for 1 second so that the reaction zone is thoroughly moistened. Remove excess liquid by stroking the edge of the strip against the rim of the vessel.
  4. Wait 2 minutes and compare the reaction zone with the color scale.

Notes

The pH of the solution being tested should be between 2 and 5. This is normally the case once the reaction has been added. If the quantity of reagent specified in the directions is not sufficient to adjust the solution to this pH (check with a pH indicator strip), strongly acidic solutions must be buffered prior to the determination with 1 mol/l sodium hydroxide solution: alkaline solutions with 1 mol/l nitric acid.

Reagent then no longer needs to be added. Also, solutions already at the correct pH do not require reagent to be added.

Because of its measuring range, the test is not suitable for checking compliance with the drinking water and discharging limits.

Directions

On surfaces:

A) 1. Apply 1-3 drops of reagent to the surface to be tested.

2. Use the top of the test strip to stir the reagent several times and leave to react for 1 minute.

3. Briefly press the reaction zone gently onto the surface and allow the solution to soak into the reaction zone.

4. Wait 1 minute and compare the reaction zone with the color scale.

B) 1. Moisten the reaction zone with 1 drop of reagent and, without delay, gently press for 2 minutes against the surface being tested.

2. Compare the reaction zone with the color scale.

Evaluation: any red coloration indicates that lead is present. If the reaction zone is colorless to yellow, no lead is present.

If the surface determination cannot be performed directly, e.g. because an exhaust pipe is positioned at an awkward angle, transfer a sample from the surface being tested to the measuring vessel and conduct the determination as follows:

Directions

Solid Sample:

  1. Use a screwdriver or similar tool to scrape a small amount of exhaust deposit into the measuring vessel.
  2. Add 5 drops of reagent, mix and leave to react for 1 minute.
  3. Immerse the test strip in the solution for 1 second so that the reaction zone is thoroughly moistened. Remove excess liquid by stroking the edge of the strip against the rim of the vessel.
  4. Wait one minute and compare the reaction zone with the color scale.

Evaluation: Any red coloration indicates that lead is present. If the reaction zone is colorless to yellow, no lead is present.

Safety Precautions

Keep the reagent (5% acetic 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

There is no interference at less than:

1000mg/l Br, BrO3 BO33–, Cl , ClO3, ClO4 , CO32–, CN, CrO42–, F, I, MoO42– , NO2, NO32-, CNO, PO43–, P2O74–, SCN, SO42–, S2O32–, S2O82–, SeO32–, WO42–, acetate, ascorbate, citrate, tartrate.
100mg/l IO3 , oxalate
10mg/l S2–, SO32–

Influence of Cations

There is no interference at less than:

1000mg/l Al3+, As3+, Ca2+, Cl2+, Cr3+, Co2+, Hg2+, K+, Li+, Mg2+, Mn2+, Na+, NH4+, Ni2+, Rb+, Sb3+, Te4+, Tl3+, V5+, Zn2+, Zr4+
300mg/l Ag+, Be2+, Bi3+, Sn2+, Ti4+, Fe2+
100mg/l Ce3+, Cu2+, Sr2+, Fe3+
10mg/l Ba2+

Standard (1000mg/l)

Lead standard solution 500ml

Package Size

10077 EM Quant® Test strips and reagent

Lead Test for 100 determinations



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