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Formaldehyde |
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Methods
Formaldehyde, a toxic substance, is used in the following applications: metal plating baths, textile treatments, biological specimen preservatives, and disinfectants of medical equipment. Commercial formaldehyde gas is readily soluble in water.
The Purpald Method
Reference: Purpald® developed by Aldrich Chemical Co. Purpald® is subject to fewer interferences than Shiffs’ reagent or chromotropic acid procedures. A purplecolored complex is formed when Purpald in alkaline solution reacts with formaldehyde. Results are expressed as ppm (mg/L) CH2O.
Shelf-life of the Purpald Reagent: six months. We recommend stocking quantities that will be used within five months. Refrigeration will dramatically extend the shelf-life of these products.
The Acid Titrimetric Method
Reference: ASTM D 2194-79, Concentration of Formaldehyde Solutions.
CHEMetrics offers a titrimetric method for formaldehyde, which uses sulfuric acid and sodium sulfite. The end point indicator, thymolphthalein, provides a sharp color change from colorless to bright blue. Results are expressed as percent (%) formaldehyde. |
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
0-1 & 1-5 ppm
0.05 ppm / Method: Purpald |
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Cat# |
| CHEMets Kit |
K-4605 |
| | CHEMets Refill, 30 ampoules, Shelf-life 5 months | R-4605 |
| | Activator Solution Pack, six 20 mL bottles | A-4201 |
| | Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-4202 |
| | Low Range Comparator, Shelf-life 2 years:
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm | C-4601 |
| | 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 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, Activator Solutions, 25 mL sample cup, instructions, and MSDS. | |
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0-30 & 30-150 ppm
5 ppm / Method: Purpald |
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Cat# |
| VACUettes Kit |
K-4605D |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | R-4605D |
| | Activator Solution Pack, six 20 mL bottles | A-4201 |
| | Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-4202 |
| | Low Range Comparator, Shelf-life 2 years:
0, 5, 7.5, 10, 15, 20, 25, 30 ppm | C-4601D |
| | High Range Comparator, Shelf-life 2 years:
30, 45, 60, 75, 87.5, 100, 112.5, 125, 150 ppm | C-4605D |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, Activator Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0-60 & 60-300 ppm
10 ppm / Method: Purpald |
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Cat# |
| VACUettes Kit |
K-4605A |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | R-4605A |
| | Activator Solution Pack, six 20 mL bottles | A-4201 |
| | Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-4202 |
| | Low Range Comparator, Shelf-life 2 years:
0, 10, 15, 20, 30, 40, 50, 60 ppm | C-4601A |
| | High Range Comparator, Shelf-life 2 years:
60, 90, 120, 150, 175, 200, 225, 250, 300 ppm | C-4605A |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, Activator Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0-120 & 120-600 ppm
20 ppm / Method: Purpald |
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Cat# |
| VACUettes Kit |
K-4605B |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | R-4605B |
| | Activator Solution Pack, six 20 mL bottles | A-4201 |
| | Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-4202 |
| | Low Range Comparator, Shelf-life 2 years:
0, 20, 30, 40, 60, 80, 100, 120 ppm | C-4601B |
| | High Range Comparator, Shelf-life 2 years:
120, 180, 240, 300, 350, 400, 450, 500, 600 ppm | C-4605B |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, Activator Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0-1200 & 1200-6000 ppm
200 ppm / Method: Purpald |
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Cat# |
| VACUettes Kit |
K-4605C |
| | VACUettes Refill, 30 ampoules, Shelf-life 5 months | R-4605C |
| | Activator Solution Pack, six 20 mL bottles | A-4201 |
| | Activator Solution, six 10 mL bottles, Shelf-life 2 years | A-4202 |
| | Low Range Comparator, Shelf-life 2 years:
0, 200, 300, 400, 600, 800, 1000, 1200 ppm | C-4601C |
| | High Range Comparator, Shelf-life 2 years:
1200, 1800, 2400, 3000, 3500, 4000, 4500, 5000, 6000 ppm | C-4605C |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Low and High Range Comparators, Activator Solutions, dilutor snapper cup, micro test tube, instructions, and MSDS. | |
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0.5-5%
0.50% / Method: Acid Titrant with Thymolphthalein Indicator |
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Cat# |
| Titrets Kit |
K-4250 |
| | Increments:
0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.9, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.5, 5.0 % | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, Indicator Solution, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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 Instrumental Kits |
0.40-8.00 ppm
Purpald |
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Cat# |
| Vacu-vials Kit, Shelf-life 5 months |
K-4203 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests (except distilled water): thirty ampoules, Activator Solutions, 25 mL sample cup, ampoule blank, instructions, calibration table, and MSDS. | |
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Kit Components common to Formaldehyde |
| Description |
Cat# |
| | Sample Cup Pack, 25 mL (6 ea) | A-0013 |
| | Micro Test Tube Pack (10 ea) | A-0015 |
| | Dilutor Snapper Cup Pack (6 ea) | A-0018 |
| | Ampoule Blank Pack (5 ea) | A-0023 |
| | Titrettor Pack (1 ea) | A-0053 |
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