Formaldehyde
www.chemetrics.com | 1-800-356-3072
Methods
Formaldehyde, a toxic substance, is used in the
Range: 0-30 & 30-150 ppm
following applications: metal plating baths, textile
MDL: 5 ppm / Method: Purpald
treatments, biological specimen preservatives, and Cat#
disinfectants of medical equipment. Commercial
VACUettes Kit K-4605D
formaldehyde gas is readily soluble in water.
VACUettes Refill, 30 ampoules, Shelf-life 6 months R-4605D
2
Activator Solution Pack, six 20 mL bottles A-4201
1, 3
The Purpald Method
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-4202
1
Reference: Purpald
®
developed by Aldrich Chemical Co.
Low Range Comparator, Shelf-life 2 years:
0, 5, 7.5, 10, 15, 20, 25, 30 ppm C-4601D
Purpald
®
is subject to fewer interferences than Shiffs’
High Range Comparator, Shelf-life 2 years:
reagent or chromotropic acid procedures. A purple-
30, 45, 60, 75, 87.5, 100, 112.5, 125, 150 ppm C-4605D
colored complex is formed when Purpald in alkaline
Kit comes in a plastic case and contains everything needed to perform 30 tests
(except distilled water): Refill, Low and High Range Comparators, Activator
solution reacts with formaldehyde. Results are Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS.
expressed as ppm (mg/L) CH
2
O.
Shelf-life of the Purpald Reagent: six months.
Range: 0-60 & 60-300 ppm
MDL: 10 ppm / Method: Purpald
We recommend stocking quantities that will be used
Cat#
within five months. Refrigeration will dramatically
VACUettes Kit K-4605A
extend the shelf-life of these products.
VACUettes Refill, 30 ampoules, Shelf-life 6 months R-4605A
2
Activator Solution Pack, six 20 mL bottles A-4201
1, 3
The Acid Titrimetric Method
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-4202
1
Reference: ASTM D 2194-79, Concentration of
Low Range Comparator, Shelf-life 2 years:
Formaldehyde Solutions.
0, 10, 15, 20, 30, 40, 50, 60 ppm C-4601A
High Range Comparator, Shelf-life 2 years:
CHEMetrics offers a titrimetric method for formalde-
60, 90, 120, 150, 175, 200, 225, 250, 300 ppm C-4605A
hyde, which uses sulfuric acid and sodium sulfite.
Kit comes in a plastic case and contains everything needed to perform 30 tests
The end point indicator, thymolphthalein, provides
(except distilled water): Refill, Low and High Range Comparators, Activator
Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS.
a sharp color change from colorless to bright blue.
Results are expressed as percent (%) formaldehyde.
Range: 0-120 & 120-600 ppm
MDL: 20 ppm / Method: Purpald
Visual Kits
Cat#
VACUettes Kit K-4605B
Range: 0-1 & 1-5 ppm
VACUettes Refill, 30 ampoules, Shelf-life 6 months R-4605B
2
MDL: 0.05 ppm / Method: Purpald
Activator Solution Pack, six 20 mL bottles A-4201
1, 3
Cat#
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-4202
1
CHEMets Kit K-4605
Low Range Comparator, Shelf-life 2 years:
CHEMets Refill, 30 ampoules, Shelf-life 6 months R-4605
2
0, 20, 30, 40, 60, 80, 100, 120 ppm C-4601B
Activator Solution Pack, six 20 mL bottles A-4201
1, 3
High Range Comparator, Shelf-life 2 years:
120, 180, 240, 300, 350, 400, 450, 500, 600 ppm C-4605B
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-4202
1
Kit comes in a plastic case and contains everything needed to perform 30 tests
Low Range Comparator, Shelf-life 2 years:
(except distilled water): Refill, Low and High Range Comparators, Activator
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm C-4601
Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS.
High Range Comparator, Shelf-life 2 years:
1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0 ppm C-4605
1
The accessory pack supplies enough solution to perform at least
Kit comes in a plastic case and contains everything needed to perform 30
200 tests.
tests (except distilled water): Refill, Low and High Range Comparators,
Activator Solutions, 25 mL sample cup, instructions, and MSDS.
2
This shelf-life can be extended by 18 months if the ampoules are
stored in the refrigerator when not in use.
3
The Activator Solution, A-4201, is supplied as a dry chemical with
NO expiration date. Once reconstituted, it has a shelf-life of 6
weeks that can be extended to 4 months if stored in the refrigera-
tor when not in use.
38
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