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

100361
$258.82
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Formaldehyde Test Strips Kit 10-100 ppm EM Quant  (1 PK of 100) HAZMAT fee incl MAIN
MSDS (Material Safety Data Sheet)

EM Quant® Formaldehyde Test, Catalog No. 10036

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

General

The EM Quant® Formaldehyde Test is a rapid semi-quantitative exploratory test for formaldehyde (formalin) in aqueous solutions in which it is often used as a disinfectant and preservative.

The test also responds to other aldehydes such as acetaldehyde or glutaraldehyde, though only at higher concentrations, when the color produced is different from that of the color scale.

Formaldehyde is used as a disinfectant for surfaces, ion exchangers, analytical instruments, medical equipment, etc., as a starting material for binders and fixing agents, and as a preservative. The effects of formaldehyde vapors on health have been the subject of much discussion; and all solutions containing formaldehyde, such as those used in connection with the above-mentioned products and applications, should be regularly checked. The fact remains that formaldehyde, with its ideal disinfectant properties, is indispensable in many technical applications, though alternative substances are increasingly being found for use within the food and cosmetics industries.

It should not be forgotten, however, that formaldehyde is also a naturally occurring breakdown and intermediate product in foods, e.g. in deep frozen cod. Enzymatic breakdown of trimethylaminooxide in the fish may release formaldehyde and thus give some hint of the age and condition of the product.

Principle of the Method

The detection reaction is based on the condensation of aldehydes with 4-amino-3-hydrazino-5-mercapto-1,2,3-triazol followed by atmospheric oxidation to yield purple-colored tetrazine derivatives.

Graduation

0 -10 - 20 - 40 - 70 - 100mg/l (ppm) formaldehyde

Directions

  1. Rinse the measuring vessel several times with some of the sample and fill to the 5ml mark.
  2. Add 10 drops of reagent (sodium hydroxide solution) and swirl carefully.
  3. Immerse the test strip in the solution for 1 second so that the reaction zone is thoroughly moistened.
  4. Remove the test strip, wipe off excess liquid by stroking the edge of the strip against the rim of the vessel, wait 1 minute and compare the reaction zone with the color scale.

Note

The sensitivity can be approximately doubled by comparing the test strip with the color scale after 2 minutes instead of after 1 minute. The concentration indicated must then be divided by 2.

Disregard any change in color occurring after 5 minutes.

Since the sample solution must be adjusted to an alkaline pH, some compounds having a disinfectant effect, (e.g. those sometimes used in cosmetic products), may release formaldehyde during the test and indicate a positive reaction even though there is no free formaldehyde present. In this case it will be necessary to perform a parallel analysis using a reference method.

Because of its measuring range, the test is unsuitable for checking formaldehyde levels in air.

Safety Precautions

Keep the reagent (32% sodium hydroxide solution) 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.

Determination in Disinfectants

Since in some instances the formaldehyde concentration will exceed the highest value on the color scale, the sample solution must be diluted to bring it within range. Of course, allowance must then be made for the dilution factor

Detection Range Sample Solution + Water Factor
20 - 200mg/l 2.5ml 2.5ml 2
100 - 1000mg/l 0.5ml 4.5ml 10
500 - 5000mg/l
(= 0.05-0.5%)
0.1ml
(2ml)
4.9ml
(98ml)
50
1000 - 10000mg/l
(=0.5-1%)
0.05ml
(1ml)
4.95ml
(99ml)
100

Dilute either by pipetting sample solution into the testing vessel and making up to 5 ml with water or by making up the milliliter quantities in brackets to 100ml. Subsequently determine as directed.

Determination in Paints

Substances which slowly release formaldehyde are added to tins of paint, etc. to prevent breakdown and moldiness during storage. The permitted limit is 10 mg per kg paint, which guarantees that the prescribed MAC value is not exceeded during application and drying, even in building interiors.

Thoroughly mix the paint with water in a 1:1 ratio and centrifuge. Take a 5 ml sample of the solution, which is usually clear, and test for formaldehydes as directed.

Interference

Ketones, esters, amides, hydrazines, hydroxylamines, quinones, aminophenol, uric acid and formic acid prevent the proper color reactions from taking place, while strong oxidizing and reducing agents interfere by reducing the detection sensitivity.

Standard (1000mg/l)

Add approximately 0.26ml of formaldehyde (min. 37%) to approximately 100ml of distilled water and titrate to determine the exact concentration. Dilute to the desired strength.

Package Size

10036 EM Quant® Test strips and reagent

Formaldehyde Test for 100 determinations



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