WO1986000711A1 - Reagent test for determining the water content of a product - Google Patents

Reagent test for determining the water content of a product Download PDF

Info

Publication number
WO1986000711A1
WO1986000711A1 PCT/SE1985/000279 SE8500279W WO8600711A1 WO 1986000711 A1 WO1986000711 A1 WO 1986000711A1 SE 8500279 W SE8500279 W SE 8500279W WO 8600711 A1 WO8600711 A1 WO 8600711A1
Authority
WO
WIPO (PCT)
Prior art keywords
reagent test
water content
product
iodine
test
Prior art date
Application number
PCT/SE1985/000279
Other languages
French (fr)
Inventor
Boz^´ena OLSSON
Original Assignee
Olsson Bozena
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olsson Bozena filed Critical Olsson Bozena
Publication of WO1986000711A1 publication Critical patent/WO1986000711A1/en

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
    • 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
    • G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
    • G01N31/168—Determining water content by using Karl Fischer reagent

Definitions

  • the invention relates to a reagent test for determining the water content of a solid, pulverulent, or liquid product.
  • the invention has been arrived at in connection with determining the water content of toluene which is recovered in printing offices.
  • Toluene- is used as a solvent for printing ink which is delivered in a viscous condition to be diluted later in the printing office to the desired viscosity by the addition of toluene.
  • toluene is evaporating, b.ut it is not permitted to discharge the evaporating toluene into the atmosphere in view of the environment protection; the evaporated toluene is taken care of in a recovering system.
  • the evaporated toluene is condensed, the condensate obtained containing some impurities such as oil , metal particles, and water.
  • the primary purpose of the invention is to make possible that the water content of toluene is determined in a simple manner which does not require the access to a laboratory but can be practised at the place where the toluene is available, but it has been found that this purpose can be realized also with regard to other liquids as well as solid and pulverulent products.
  • the invention provides a reagent test for determining the water content of a solid, pul verul ent, or liquid product, which is characterized by a first component comprising water-soluble starch, and a second component comprising iodine in solid form or waterfree solution, the presence of water in the product being indicated by blue colour ⁇ ing of the reagent test when contacted with the product.
  • the invention will be explained in more detail below applied to practical examples.
  • the reagent test of the invention includes two components one of which comprises water-soluble starch which can be in a dry condition, and the other one comprises iodine which can be in solid form or can comprise an alcohol solution such as an ethanol solution containing about 15 % iodine. Preferably, equal amounts by weight of the two components are used.
  • the amount of precip tation will be larger the more water present in the toluene.
  • aromatic solvents which can be investigated as to the existing water content in the same manner as toluene, are e.g. aircraft fuel , gazoline, heavy oil , fuel oil , benzene, and xylene. .A1so other organic solvents such as chloroform can be investigated as to
  • the reagent test is also suitable for a first test analysis of sugar products, grain products, flour products, paper and cellulose in order to determine the water contents thereof.
  • the carbo ⁇ hydrates which have been investigated are the following: a) monosacchari des : glycose, fructose, galactose,
  • disaccharides saccharose, lactose, maltose, c e 11 o b i o s e , c) polysaccharides : cellulose, starch.
  • one component of the reagent test comprises a 15 % iodine solution diluted with 100 %
  • an aromatic solvent initially has to be added to the reagent test, and preferably waterfree toluene or p-xylene is used for this purpose. About 5 ml of this solvent is poured into a test glass, starch and iodine solution then being added together with a test substance, e.g. a pulverulent test sub ⁇ stance. In the same manner as described above the test glass is shaken to dissolve iodine and starch in the solvent, a more or less intense blue colouring being obtained should the test substance added contain more or less water.
  • the solvent with iodine and starch dissolved therein can be poured onto the solid test substance, but it is also possible to cover the solid substance, e.g. a paper sample, with the dry starch and then pour the solvent, i .e. toluene or p-xylene, with iodine dissolved therein, onto the covering starch.
  • the water content of different pulverulent or pulverized chemicals or medicines can be determined by using the reagent test of the invention provided that the chemicals or medicines are substantially whi te or uncoloured such that the blue colouring obtained by means of the reagent test can be observed.
  • a colour scale can be constructed.
  • the reagent test is added to several different samples which al l comprise one and the same test substance, e.g. toluene, but have different known water contents.
  • a blue colouring of different intensity depending on the existing water content and by guidance thereof a colour scale can be constructed.
  • a comparison is then made with this colour scale for determining approximately the water content of a test substance having an unknown water content.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

A reagent test for determining the water content of a solid, pulverulent, or liquid product. The reagent test includes a first component comprising water-soluble starch, and a second component comprising iodine in solid form or waterfree solution.

Description

1
REAGENT TEST FOR DETERMINING THE WATER CONTENT OF A PRODUCT
The invention relates to a reagent test for determining the water content of a solid, pulverulent, or liquid product.
The invention has been arrived at in connection with determining the water content of toluene which is recovered in printing offices. Toluene-is used as a solvent for printing ink which is delivered in a viscous condition to be diluted later in the printing office to the desired viscosity by the addition of toluene. In the printing machines, toluene is evaporating, b.ut it is not permitted to discharge the evaporating toluene into the atmosphere in view of the environment protection; the evaporated toluene is taken care of in a recovering system. In this system, the evaporated toluene is condensed, the condensate obtained containing some impurities such as oil , metal particles, and water. The major part of these impurities is removed in filters and water separators, but as far as the water content is concerned the purification 'can be carried on to such extent only that tne remaining water content of the toluene is in the range from 0.005 % to 0.05 % . Due to the existing water content the toluene is not chemically pure; it is considered a second class product. Neverthe¬ less sucn toluene is v e ry coveted by the ink industry due to the low price thereof. However, different customers raise different demands on the purity of the toluene and, therefore, it is desired to be able to demonstrate in a simple manner how large the water content is .
Methods are already known for demonstrating the water content of toluene, and the most common and known method is the reagent test method according to Karl Fischer. However, this method must be practised in a "laboratory, which is a clear drawback, because specific equipment is required, and the method is time-consuming and expensive.
The primary purpose of the invention is to make possible that the water content of toluene is determined in a simple manner which does not require the access to a laboratory but can be practised at the place where the toluene is available, but it has been found that this purpose can be realized also with regard to other liquids as well as solid and pulverulent products. In order to realize said purpose the invention provides a reagent test for determining the water content of a solid, pul verul ent, or liquid product, which is characterized by a first component comprising water-soluble starch, and a second component comprising iodine in solid form or waterfree solution, the presence of water in the product being indicated by blue colour¬ ing of the reagent test when contacted with the product. The invention will be explained in more detail below applied to practical examples.
The reagent test of the invention includes two components one of which comprises water-soluble starch which can be in a dry condition, and the other one comprises iodine which can be in solid form or can comprise an alcohol solution such as an ethanol solution containing about 15 % iodine. Preferably, equal amounts by weight of the two components are used.
When the reagent test is used for determining the water content of toluene, aoout 15 ml of the toluene is poured into a test glass, the two components of the reagent test then being added. The test glass then is shaken until the reagent test has been solved in the toluene. If water is present in the toluene, there is obtained a blue-coloured precipitation due to the fact that the iodine ions are oxidated to iodine according to the relation J~? J2 + 2e"
The amount of precip tation will be larger the more water present in the toluene.
Other aromatic solvents which can be investigated as to the existing water content in the same manner as toluene, are e.g. aircraft fuel , gazoline, heavy oil , fuel oil , benzene, and xylene. .A1so other organic solvents such as chloroform can be investigated as to
10 the existing water content by using the reagent test of the invention. The tests are easily practised at any place, and the reagent test reacts to the existing water content at high sensitivity. E.g. Water contents ranging from 0.005 * to 0.05 % of toluene can be
15 demonstrated .
The reagent test is also suitable for a first test analysis of sugar products, grain products, flour products, paper and cellulose in order to determine the water contents thereof. Thus, it has proved possible
20 to demonstrate by using the reagent test of the invention a water content of different carbohydrates with an accuracy of 0.1 % to 0.2 % water content. The carbo¬ hydrates which have been investigated are the following: a) monosacchari des : glycose, fructose, galactose,
25 b) disaccharides: saccharose, lactose, maltose, c e 11 o b i o s e , c) polysaccharides : cellulose, starch.
When the reagent test has been used with starch, it has in fact been possible to obtain an accuracy of
30. 0.01 %.
It has been found that the sensitivity of the re¬ agent test can be increased by the addition of acetic acid. In that case one component of the reagent test comprises a 15 % iodine solution diluted with 100 %
35 acetic acid in the approximate relationship 1 :1. When 'the reagent test is to be used with solid or pulverulent products, an aromatic solvent initially has to be added to the reagent test, and preferably waterfree toluene or p-xylene is used for this purpose. About 5 ml of this solvent is poured into a test glass, starch and iodine solution then being added together with a test substance, e.g. a pulverulent test sub¬ stance. In the same manner as described above the test glass is shaken to dissolve iodine and starch in the solvent, a more or less intense blue colouring being obtained should the test substance added contain more or less water.
If a solid test substance is concerned, the solvent with iodine and starch dissolved therein can be poured onto the solid test substance, but it is also possible to cover the solid substance, e.g. a paper sample, with the dry starch and then pour the solvent, i .e. toluene or p-xylene, with iodine dissolved therein, onto the covering starch.
Also the water content of different pulverulent or pulverized chemicals or medicines can be determined by using the reagent test of the invention provided that the chemicals or medicines are substantially whi te or uncoloured such that the blue colouring obtained by means of the reagent test can be observed.
In order to determine in a simple manner the approximate water content a colour scale can be constructed. For this purpose the reagent test is added to several different samples which al l comprise one and the same test substance, e.g. toluene, but have different known water contents. In the different samples there is obtained a blue colouring of different intensity depending on the existing water content, and by guidance thereof a colour scale can be constructed. A comparison is then made with this colour scale for determining approximately the water content of a test substance having an unknown water content.

Claims

1. Reagent test for determining the water content of a solid, pulverulent, or liquid product, which is c h a r a c t e r i z e d by a first component compris¬ ing water-soluble starch, and a second component comprising iodine in solid form or waterfree solution, the presence of water in the product being indicated by blue colouring of the reagent test when contacted with the product.
2. Reagent test as claimed in claim 1, c h a r a c t e r i z e d in that the iodine comprises an alcohol solution, e.g. an ethanol solution, contain¬ ing 15 % of iodine .
3. Reagent test as claimed in claim 1, c h a r a c t e r i z e d in that the reagent test comprises substantially equal amounts by weight of the two components .
4. Reagent test as claimed in claim 1, c h a r a c t e r i z e d in that the iodine solution is diluted with acetic acid, preferably in the approximate relationship 1:1.
5. Reagent test as claimed in claim 1, c h a r a c t e r i z e d in that the reagent test is dissolved in a waterfree aromatic solvent, e.g. to! uene or p-x 1 ene .
6. Reagent test as clai ed in clai 5, c h a r a c t e r i z e d in that the solvent is the product to be investigated by means of the reagent test.
PCT/SE1985/000279 1984-07-12 1985-07-12 Reagent test for determining the water content of a product WO1986000711A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8403682A SE8403682L (en) 1984-07-12 1984-07-12 REAGENTS FOR DETERMINATION OF THE WATER CONTENT OF A PRODUCT AND USE OF THE REAGENT
SE8403682-1 1984-07-12

Publications (1)

Publication Number Publication Date
WO1986000711A1 true WO1986000711A1 (en) 1986-01-30

Family

ID=20356512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1985/000279 WO1986000711A1 (en) 1984-07-12 1985-07-12 Reagent test for determining the water content of a product

Country Status (4)

Country Link
EP (1) EP0188516A1 (en)
AU (1) AU4634285A (en)
SE (1) SE8403682L (en)
WO (1) WO1986000711A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504009A (en) * 1991-07-16 1996-04-02 Tadahiro Ohmi Method of and device for measuring water content
WO1998016821A1 (en) * 1996-10-16 1998-04-23 Environmental Test Systems, Inc. Device and method for the determination of water
WO2010118323A1 (en) * 2009-04-10 2010-10-14 Danisco Us Inc. Cellulase-containing dish detergents

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950958A (en) * 1956-09-24 1960-08-30 Nesh Florence Determination of minute traces of water by use of methylene blue
US2963442A (en) * 1957-02-28 1960-12-06 Emory T Erickson Dual purpose dry starch indicator
US3003353A (en) * 1958-09-29 1961-10-10 Yosemite Chemical Co Method and apparatus for testing oil for moisture content
US3505020A (en) * 1967-05-25 1970-04-07 Exxon Research Engineering Co Method and composition for detecting free water
DE1961811A1 (en) * 1969-12-10 1971-06-16 Exxon Research Engineering Co Indicator for free water detn in hydrocar- - bon fuels
DE3018257A1 (en) * 1980-05-13 1981-11-19 Melitta-Werke Bentz & Sohn, 4950 Minden Moisture indicator based on cobalt amine complex - embedded in silicone resin, esp. useful for evaluating effectiveness of humidifier
EP0078544A1 (en) * 1981-11-03 1983-05-11 LUCAS INDUSTRIES public limited company Reagent and process for the detection of a critical water content in hydraulic fluids, especially brake fluids

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950958A (en) * 1956-09-24 1960-08-30 Nesh Florence Determination of minute traces of water by use of methylene blue
US2963442A (en) * 1957-02-28 1960-12-06 Emory T Erickson Dual purpose dry starch indicator
US3003353A (en) * 1958-09-29 1961-10-10 Yosemite Chemical Co Method and apparatus for testing oil for moisture content
US3505020A (en) * 1967-05-25 1970-04-07 Exxon Research Engineering Co Method and composition for detecting free water
DE1961811A1 (en) * 1969-12-10 1971-06-16 Exxon Research Engineering Co Indicator for free water detn in hydrocar- - bon fuels
DE3018257A1 (en) * 1980-05-13 1981-11-19 Melitta-Werke Bentz & Sohn, 4950 Minden Moisture indicator based on cobalt amine complex - embedded in silicone resin, esp. useful for evaluating effectiveness of humidifier
EP0078544A1 (en) * 1981-11-03 1983-05-11 LUCAS INDUSTRIES public limited company Reagent and process for the detection of a critical water content in hydraulic fluids, especially brake fluids

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Chemical Abstracts, Vol 7a, Abs No 19076d, issued April 15 1970 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504009A (en) * 1991-07-16 1996-04-02 Tadahiro Ohmi Method of and device for measuring water content
WO1998016821A1 (en) * 1996-10-16 1998-04-23 Environmental Test Systems, Inc. Device and method for the determination of water
WO2010118323A1 (en) * 2009-04-10 2010-10-14 Danisco Us Inc. Cellulase-containing dish detergents

Also Published As

Publication number Publication date
EP0188516A1 (en) 1986-07-30
SE8403682D0 (en) 1984-07-12
SE8403682L (en) 1986-01-13
AU4634285A (en) 1986-02-10

Similar Documents

Publication Publication Date Title
Marsh et al. Simple charring method for determination of lipids
Babson et al. A new assay for cholesterol and cholesterol esters in serum which is not affected by bilirubin
Powell Preparation of indole extracts from plants for gas chromatography and spectrophotofluorometry
KR100991585B1 (en) Aromatic Ester For Marking Or Tagging Organic Products
Clark et al. New fluorometric method for the determination of cortisol in serum
WO1986000711A1 (en) Reagent test for determining the water content of a product
Abdel-hay et al. Colorimetric determination of seven nonsteroidal antiinflammatory drugs using 2-nitrophenylhydrazine hydrochloride
CA2131999A1 (en) Fast response test panel
ANDERSON A partial fractionation of alkali‐soluble soil organic phosphate
Klungsöyr et al. A method for the determination of cholesterol in blood serum
Roscoe et al. Removal of fecal pigments and its application to the determination of fecal bile acids in the rat
Farag Separation and analysis of some sugars by using thin layer chromatography
EP0757792B1 (en) Test for petroleum hydrocarbon contamination using dichloromethane
Carney et al. A semicontinuous assay for glycogen phosphorylase
Maher et al. Determination of Polycyclic Aromatic Hydrocarbons in Marine Sediments, using Solvent Extraction, Thin-Layer Chromatography and SpectrofIuorimetry
Kushinsky et al. A non-chromatographic radioimmunoassay of estrone and estradiol-17β in serum
Tourtellotte et al. A study of lipids in the cerebrospinal fluid: IV. The determination of free and total cholesterol
Zeitman Rapid method for determining free and esterified cholesterol in plasma extracts
SU1109631A1 (en) Vitamin k1 determination method
GB1007315A (en) Stream analyzer and process for using same
EP0204579A3 (en) Immunoassay incubation device
Lyle et al. Thin-layer chromatographic separation and subsequent determination of some water-soluble dyestuffs
US20040209373A1 (en) Method and apparatus for the determination of water in materials
Cieri Detection of arsanilic acid in animal feeds
Kushinsky et al. Gas chromatographic determination of estrone, estradiol and estriol in non-pregnancy plasma

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): AU DK FI JP NO US

AL Designated countries for regional patents

Designated state(s): AT BE CH DE FR GB IT LU NL SE