GB1163647A - The Estimation of Tolylene Diisocyanna in the Atmosphere. - Google Patents
The Estimation of Tolylene Diisocyanna in the Atmosphere.Info
- Publication number
- GB1163647A GB1163647A GB3483567A GB3483567A GB1163647A GB 1163647 A GB1163647 A GB 1163647A GB 3483567 A GB3483567 A GB 3483567A GB 3483567 A GB3483567 A GB 3483567A GB 1163647 A GB1163647 A GB 1163647A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nitrite
- paper
- hydroxy
- estimation
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Biophysics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
1,163,647. Determining di-isocyanates. IMPERIAL CHEMICAL INDUSTRIES Ltd. 25 July, 1968 [28 July, 1967], No. 34835/67. Heading B1X. [Also in Division Gl] A gas permeable filter paper of predetermined size impregnated with a solution of a soluble nitrite, a coupling agent, a buffer and a dialkyl phthalate in methyl alcohol and water and dried, is used for the estimation of 2:4 and 2:6 tolylene diisocyanates in the atmosphere by a method which comprises passing a predetermined volume of air through the paper, and comparing the colour produced on the paper with calibrated colour standards. The coupling agent may be 2:3-hydroxy naphthoic anilide or 2:3-hydroxy naphthoic mnitroanilide but is preferably 5-hydroxy-3<SP>1</SP>, 4<SP>1</SP>- benzocarbazole-4-carboxy-p-anisidide, and the soluble nitrite may be an alkali metal nitrite such as sodium or potassium nitrite or ammonium nitrite. The preferred buffer is ammonium acetate and the preferred dialkyl phthalate is diethyl phthalate. The preparation of the colour standards using fast pigments is described in the specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3483567A GB1163647A (en) | 1967-07-28 | 1967-07-28 | The Estimation of Tolylene Diisocyanna in the Atmosphere. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3483567A GB1163647A (en) | 1967-07-28 | 1967-07-28 | The Estimation of Tolylene Diisocyanna in the Atmosphere. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1163647A true GB1163647A (en) | 1969-09-10 |
Family
ID=10370487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3483567A Expired GB1163647A (en) | 1967-07-28 | 1967-07-28 | The Estimation of Tolylene Diisocyanna in the Atmosphere. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1163647A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3407687C1 (en) * | 1984-03-02 | 1985-08-01 | Drägerwerk AG, 2400 Lübeck | Methods for the determination of organic isocyanates in air |
| WO2007129965A1 (en) * | 2006-05-08 | 2007-11-15 | Provtagaren Ab | Sampling device |
-
1967
- 1967-07-28 GB GB3483567A patent/GB1163647A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3407687C1 (en) * | 1984-03-02 | 1985-08-01 | Drägerwerk AG, 2400 Lübeck | Methods for the determination of organic isocyanates in air |
| US4613575A (en) * | 1984-03-02 | 1986-09-23 | Dragerwerk Aktiengesellschaft | Indicator for determining organic isocyanates on a carrier |
| WO2007129965A1 (en) * | 2006-05-08 | 2007-11-15 | Provtagaren Ab | Sampling device |
| US8034624B2 (en) | 2006-05-08 | 2011-10-11 | Provtagaren Ab | Sampling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |