DE2046174A1 - Water hardness determination - in eg washing plants, using edta - Google Patents
Water hardness determination - in eg washing plants, using edtaInfo
- Publication number
- DE2046174A1 DE2046174A1 DE19702046174 DE2046174A DE2046174A1 DE 2046174 A1 DE2046174 A1 DE 2046174A1 DE 19702046174 DE19702046174 DE 19702046174 DE 2046174 A DE2046174 A DE 2046174A DE 2046174 A1 DE2046174 A1 DE 2046174A1
- Authority
- DE
- Germany
- Prior art keywords
- water
- hardness
- substance
- edta
- tablets
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1853—Water hardness of water
-
- 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
Abstract
Description
Substanz zur Bestimmung der Härtebildner in Wässern Die Erfindung betrifft eine Substanz zur Bestimmung der Härtebildner in Wässern. Substance for the determination of hardness components in water The invention relates to a substance for determining the hardness components in water.
Die Rärtebestimmung von Wässern wird üblicherweise gelatometrisch mit Farb- bzw. Metallindikatoren, die teilweise bereits eine Puffersubstanz enthalten, durchgeführt. Mit diesem Verfahren kann die Härte sehr genau bestimmt werden. Es ist aber notwendig, eine Titration durchzuführen. Diese Titrationen können nur von geschulten Fachkräften gemacht werden, so daß dieses Verfahren im täglichen Leben nicht angewendet werden kann.The hardness determination of water is usually gelatometric with color or metal indicators, some of which already contain a buffer substance, carried out. With this method, the hardness can be determined very precisely. It however, it is necessary to carry out a titration. These titrations can only be carried out by trained professionals so that this procedure can be used in daily life cannot be used.
Es ist aber heute bereits in vielen Bereichen notwendig, die Wasserhärte bzw. einen Grenzwert der Wasserhärte zu bestimmen. Dies trifft z.B. zu bei Spülmaschinen, Waschmaschinen, Waschanlagen und sonstigen Apparaturen, deren einwandfreies Funktionieren oder richtiges Dosieren der Zusätze von der Wasserhärte abhängig ist. Bei diesen Apparaturen wird zum Großteil bereits für die Garantie eines einwandfreien Laufes nur ein maximaler Gehalt an Härtebildnern (Ca++, Mg++) zugelassen.But it is already necessary in many areas today, the water hardness or to determine a limit value for the water hardness. This applies e.g. to dishwashers, Washing machines, washing systems and other equipment, their proper functioning or correct dosing of the additives depends on the hardness of the water. With these Apparatus is for the most part already used to guarantee proper operation only a maximum content of hardness components (Ca ++, Mg ++) is permitted.
Aufgabe der Erfindung ist es, eine Möglichkeit zu finden, die es dem Nichtfachmann ermöglicht, dies Grenzen zu b?stimmen.The object of the invention is to find a way that the It is possible for non-experts to adjust these limits.
Dies wird erfindunsgemäß dadurch erreicht, daß die SuL-stanz einen für Wasserhärte üblichen Netallindikator, einen alkalischen Puffer und Äthylendiauintetrae3sigsäure in äquivalenter Menge zur gewünschten Wasserhärte enthält, und daß zur Erhöhung der Alkalität Natron- und/oder Kalilauge zugesetzt wird.This is achieved according to the invention in that the SuL punch a normal metal indicator for water hardness, an alkaline buffer and ethylenediamine tetraacetic acid contains in an amount equivalent to the desired water hardness, and that to increase sodium hydroxide and / or potassium hydroxide solution is added to the alkalinity.
Als besonders vorteilhaft hat es sich erwiesen, diese Substanz in zwei Tabletten herzustellen, wobei die eine Tablette aus dem für Wasserhärte üblichen Metallindikator, dem alkalischen Puffer und Äthylendiamintetraessigsäure und die andere Tablette aus Natron- und/oder Kalilauge besteht. Zur besseren Handhabung der Tabletten werden diese zweckmäßigerweise paarweise in Kunststoffolie gepreßt.It has proven to be particularly advantageous to use this substance in to produce two tablets, one of which is made from the standard for water hardness Metal indicator, the alkaline buffer and ethylenediaminetetraacetic acid and the Another tablet consists of sodium hydroxide and / or potassium hydroxide solution. For better handling of the tablets, these are expediently pressed in pairs in plastic film.
Es ist auch möglich, mehrere Paare hintereinander in eine Kunststoffolie zu pressen, wobei jedes Paar auf eine andere Härte reagiert. Dadurch wäre es möglich, dies Tablettenkombination praktisch wie Indikatorpapier zu verwenden.It is also possible to put several pairs in a row in a plastic film to press, each pair reacting to a different hardness. This would make it possible this tablet combination can be used practically like indicator paper.
Die Handhabung der Tabletten geht nun folgendermaßen vor. In einer definierten Menge Wasser wird zuerst Tablette 1 (Metallindikator, alkalischer Puffer und Äthylendiamintetraessigsäure) gelöst, dann wird Tablette 2 (Natron- und/oder Kalilauge) dazugegeben. Rote Färbung zeigt dann Überschreiten, grüne Färbung das Unterschreiten des Schwellwertes an.The handling of the tablets now proceeds as follows. In a defined amount of water is first tablet 1 (metal indicator, alkaline buffer and ethylenediaminetetraacetic acid), then tablet 2 (soda and / or Potash lye) was added. Red coloring then shows exceeding, green coloring that Falling below the threshold value.
Der Metallindikator besteht in diesem Fall aus Kalgon-Carbon-Säure und Methylrot, der Puffer aus Ammoniuu-Carbonat.The metal indicator in this case consists of Kalgon carboxylic acid and methyl red, the ammonium carbonate buffer.
Es könnte als Metallindikator auch beispielsweise Eriochromschwarz T verwendet werden.It could also be used as a metal indicator, for example eriochrome black T can be used.
Diese Art der Bestimmung der Härtebildner in Wässern (Schwellwertbestimmung) hat den großen Vorteil, daß sie von jedermann ohne jegliche chemische Vorkenntnisse angewendet werden kann.This type of determination of the hardness components in water (threshold value determination) has the great advantage that it can be used by anyone without any prior knowledge of chemistry can be applied.
Die Anordnung von ganzen Härteskalen bietet praktisch eine unbegrenzte Anwendbarkoit wie das Titrationsverfahren. Die umständliche Titration, die chemische Vorbildung erfordert, ist bei dieser Art der Härtebestimmung nicht notwendig.The arrangement of whole hardness scales offers practically an unlimited number Applicability like the titration method. The cumbersome titration, the chemical one Requires prior training, is not necessary for this type of hardness determination.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702046174 DE2046174A1 (en) | 1970-09-18 | 1970-09-18 | Water hardness determination - in eg washing plants, using edta |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702046174 DE2046174A1 (en) | 1970-09-18 | 1970-09-18 | Water hardness determination - in eg washing plants, using edta |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2046174A1 true DE2046174A1 (en) | 1972-03-23 |
Family
ID=5782807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19702046174 Pending DE2046174A1 (en) | 1970-09-18 | 1970-09-18 | Water hardness determination - in eg washing plants, using edta |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2046174A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397075C (en) * | 1999-11-25 | 2008-06-25 | 三浦工业株式会社 | Hardness indicator composition for water hardness measurement and hardness measuring method |
-
1970
- 1970-09-18 DE DE19702046174 patent/DE2046174A1/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397075C (en) * | 1999-11-25 | 2008-06-25 | 三浦工业株式会社 | Hardness indicator composition for water hardness measurement and hardness measuring method |
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