DE1199023C2 - Indicator substance for determining the water hardness - Google Patents
Indicator substance for determining the water hardnessInfo
- Publication number
- DE1199023C2 DE1199023C2 DE1958H0033488 DEH0033488A DE1199023C2 DE 1199023 C2 DE1199023 C2 DE 1199023C2 DE 1958H0033488 DE1958H0033488 DE 1958H0033488 DE H0033488 A DEH0033488 A DE H0033488A DE 1199023 C2 DE1199023 C2 DE 1199023C2
- Authority
- DE
- Germany
- Prior art keywords
- indicator
- indicator substance
- determining
- water hardness
- ethylenediaminetetraacetic acid
- 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
- 239000000126 substance Substances 0.000 title claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 6
- 239000000975 dye Substances 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- SXYCCJAPZKHOLS-UHFFFAOYSA-N chembl2008674 Chemical compound [O-][N+](=O)C1=CC=C2C(N=NC3=C4C=CC=CC4=CC=C3O)=C(O)C=C(S(O)(=O)=O)C2=C1 SXYCCJAPZKHOLS-UHFFFAOYSA-N 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 239000003085 diluting agent Substances 0.000 claims description 2
- KCIDZIIHRGYJAE-YGFYJFDDSA-L dipotassium;[(2r,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] phosphate Chemical class [K+].[K+].OC[C@H]1O[C@H](OP([O-])([O-])=O)[C@H](O)[C@@H](O)[C@H]1O KCIDZIIHRGYJAE-YGFYJFDDSA-L 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000007983 Tris buffer Substances 0.000 description 3
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000003926 complexometric titration Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- MVXKSQUADMAAIE-UHFFFAOYSA-L calcium hydrogen carbonate hydrate Chemical compound O.[Ca++].OC([O-])=O.OC([O-])=O MVXKSQUADMAAIE-UHFFFAOYSA-L 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1853—Hardness of water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
Das Hauptpatent schlägt speziell zur Bestimmung der Wasserhärte mit Hilfe von in fester Form dosierten Chelatbildnern vor, die Indikatorsubstanz mittels eines Zusatzes von Trioxymethylaminomethan, auch kurz »Tris« genannt, in stabilisierter fester Form herzustellen und betrifft demnach in fester Form, vorzugsweise als Preßkörper dosierbare Reagenzien zur komplexometrischen Bestimmung von Calcium und/ oder Magnesium, die dadurch gekennzeichnet sind, daß die äthylendiamintetraessigsaure Titriersubstanz, die Indikatorsubstanz oder beide als Verfestigungsbzw. Verdünnungsmittel Trioxymethylaminomethan enthalten.The main patent specifically proposes to determine the water hardness with the help of dosed in solid form Chelating agents, the indicator substance by means of an addition of trioxymethylaminomethane, too called "Tris" for short, to be produced in a stabilized solid form and therefore concerns in solid form, preferably reagents that can be dosed as compacts for the complexometric determination of calcium and / or magnesium, which are characterized in that the ethylenediaminetetraacetic acid titrant, the indicator substance or both as Verfestigungsbzw. Diluent trioxymethylaminomethane contain.
Neben vielen Vorzügen hat die Verwendung von Tris aber einen Nachteil: aus calciumbikarbonathaltigem Wasser (Karbonathärte) wird durch Zugabe des alkalisch reagierenden Tris Calciumkarbonat ausgefällt und dadurch ein Teil des Calciums aus der zu untersuchenden Probe entfernt. Die Durchführung einer Analyse ist unter diesen Umständen nicht möglich.In addition to many advantages, the use of Tris has one disadvantage: it is made from calcium bicarbonate Water (carbonate hardness) is precipitated by adding the alkaline Tris calcium carbonate and thereby removing some of the calcium from the sample to be examined. The implementation an analysis is not possible under these circumstances.
Die vorliegende Erfindung betrifft nun eine Verbesserung des Gegenstands des Hauptpatentes und sieht vor, daß in dem Eriochromschwarz T oder ähnliche metallspezifische Indikatorfarbstoffe enthaltenden alkalischen Indikatorgemisch der Magnesiumkomplex des Dikaliumsalzes der Äthylendiamintetraessigsaure in zehn- bis hundertfacher Menge des Farbstoffes enthalten ist. Dies bewirkt eine komplexe Bindung des Calciums, wodurch die äquivalente Menge Magnesium in Freiheit gesetzt wird. Dieses bleibt in Lösung und kann dann leicht komplexometrisch erfaßt werden.The present invention now relates to an improvement on the subject matter of the main patent and provides that in the Eriochrome black T or similar metal-specific indicator dyes containing alkaline indicator mixture of the magnesium complex of the dipotassium salt of ethylenediaminetetraacetic acid is contained in ten to one hundred times the amount of the dye. This creates a complex bond of calcium, which sets free the equivalent amount of magnesium. This stays in Solution and can then easily be recorded complexometrically.
Ein für die komplexometrische Titration geeigneter Indikatorfarbstoff, wie z. B. Eriochromschwarz T, oder ein Farbstoffgemisch wird zusammen mit dem Zehn- bis Hundertfachen der Menge des Farbstoffs an Magnesiumkomplex eines Dialkalisalzes der Äthylendiamintetraessigsaure und einer mindestens gleich großen oder wesentlich größeren Menge Tris-oxymethylaminomethan gut gemischt. Das Gemisch wird mit lO°/o seines Gewichtes an destilliertem Wasser gleichmäßig durchfeuchtet, um einen chemischen Umsatz zu bewirken. Darauf wird entweder durch ein Sieb gedrückt oder sofort bei erhöhter Temperatur getrocknet. Anschließend kann entweder das Pulver oder das Granulat verwendet werden, oder es können zum Zwecke einer leichteren Dosierung Formkörper, z. B. Tabletten, daraus gepreßt werden.An indicator dye suitable for complexometric titration, such as B. Eriochrome black T, or a mixture of dyes is added along with ten to one hundred times the amount of the dye on magnesium complex of a dialkali salt of ethylenediaminetetraacetic acid and an at least equal or significantly larger amount of tris-oxymethylaminomethane well mixed. The mixture is made with 10% of its weight in distilled water evenly moistened to cause chemical conversion. It is either through a Sieve pressed or immediately dried at an elevated temperature. You can then either use the powder or the granules can be used, or for the purpose of easier dosing, molded bodies, z. B. tablets are pressed from it.
Der so hergestellte Indikator zeichnet sich durch wesentlich erhöhte Haltbarkeit und intensivere Färbung aus. Nach der Auflösung in etwa hundertfacher Gewichtsmenge Wasser verleiht er der Lösung einen pH-Wert von etwa 9 bis 1.0, welcher für die Durchführung einer Wasserhärtebestimmung optimal ist. Da gleichzeitig die Ausfällung von Calziumkarbonat aus harten Wasserproben verhindert wird, ist ein scharfer Umschlagpunkt bei der komplexometrischen Titration gewährleistet.The indicator produced in this way is characterized by a significantly increased durability and more intense color out. After dissolving in about a hundred times the amount by weight of water, it gives the solution a pH value of around 9 to 1.0, which is optimal for performing a water hardness determination. Since the precipitation of calcium carbonate from hard water samples is prevented at the same time, a A sharp changeover point is guaranteed in the complexometric titration.
Das Indikatorgemisch kann in Pulver- oder Granulatform Verwendung finden, das in ein verschließbares Röhrchen abgefüllt ist, und mit einem Meßlöffel abgemessen werden. Das Indikatorgemisch kann selbstverständlich auch in Form von Tabletten Verwendung finden, deren Größe in zweckentsprechender Weise dem zu untersuchenden Wasservolumen angepaßt ist, obwohl die Indikatormenge nicht kritisch ist und ohne Nachteil auch in Überschuß benutzt werdenThe indicator mixture can be used in powder or granular form, and in a sealable Tube is filled and measured with a measuring spoon. The indicator mixture can of course also find use in the form of tablets, the size of which in an appropriate manner is adapted to the volume of water to be examined, although the amount of indicator is not critical and can also be used in excess without disadvantage
' kann.' can.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1958H0033488 DE1199023C2 (en) | 1958-06-06 | 1958-06-06 | Indicator substance for determining the water hardness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1958H0033488 DE1199023C2 (en) | 1958-06-06 | 1958-06-06 | Indicator substance for determining the water hardness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE1199023B DE1199023B (en) | 1965-08-19 |
| DE1199023C2 true DE1199023C2 (en) | 1973-12-13 |
Family
ID=7152161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1958H0033488 Expired DE1199023C2 (en) | 1958-06-06 | 1958-06-06 | Indicator substance for determining the water hardness |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1199023C2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE817045C (en) * | 1949-05-24 | 1951-10-15 | Hans Guenter Dr Hoeck | Procedure for testing pickling baths |
-
1958
- 1958-06-06 DE DE1958H0033488 patent/DE1199023C2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE817045C (en) * | 1949-05-24 | 1951-10-15 | Hans Guenter Dr Hoeck | Procedure for testing pickling baths |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1199023B (en) | 1965-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C2 | Grant after previous publication (2nd publication) |