EP0352319A1 - Analyse de l'aluminium contenu dans de l'eau potable - Google Patents

Analyse de l'aluminium contenu dans de l'eau potable

Info

Publication number
EP0352319A1
EP0352319A1 EP19890902062 EP89902062A EP0352319A1 EP 0352319 A1 EP0352319 A1 EP 0352319A1 EP 19890902062 EP19890902062 EP 19890902062 EP 89902062 A EP89902062 A EP 89902062A EP 0352319 A1 EP0352319 A1 EP 0352319A1
Authority
EP
European Patent Office
Prior art keywords
aluminium
fluoride
mixed liquid
sample stream
solution
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.)
Ceased
Application number
EP19890902062
Other languages
German (de)
English (en)
Inventor
Bryan Dale
Peter George Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ANALAQ Ltd
Original Assignee
ANALAQ Ltd
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 ANALAQ Ltd filed Critical ANALAQ Ltd
Publication of EP0352319A1 publication Critical patent/EP0352319A1/fr
Ceased legal-status Critical Current

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
    • G01N31/16—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
    • G01N31/166—Continuous titration of flowing liquids
    • 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
    • G01N33/1813—Specific cations in water, e.g. heavy metals

Definitions

  • This invention is concerned with the determination of trace quantities of aluminium in a water supply.
  • the preferred range of pHs employed in the process is 4.0 to 5.5 and the buffered standard solution is desirably chosen to maintain a narrow band of pH within 'that range.
  • the band width is 4.5 to 5.0.
  • V Target is the volume of the buffered fluoride ion solution
  • x is the number of fluoride ions in the complex molecule
  • the equipment preferably also com ⁇ prises two reservoirs adapted to contain, respectively, first and second standard solutions of an aluminium salt differing in salt concentration, valve means to control the flow of standard solution from each reservoir, a third conduit adapted to receive liquid from the valve means, a confluence of the third conduit with the second conduit, valve means to control the entry of the sample stream into the first conduit and an automatic sequencer adapted to open the valve means in sequence for predetermined periods in such a way that only one of the sample stream, the first and the second standard aluminium salt solutions may flow into the confluence with the second conduit at a time.
  • the means to impose a standard temperature on the mixed liquid includes a digester coil and one or more reactor coils all maintained at the desired temperature.
  • the said means warms the mixed liquid to 45°C for at least five minutes to ensure the equi ibration of complex formation and, to this end, it is convenient that the conduit for the mixed liquid should be a helix or other labyrinthine structure within a heated member (e.g. a heated fluid bath).
  • Figure 1 is a schematic block diagram of one embodi ⁇ ment of equipment for carrying out the method
  • a conduit 1 is a side branch on a pipe 2 through which water to be sampled is flowing in the direction of the arrow A.
  • Reservoirs 3 and 4 respec ⁇ tively contain different standard solutions of aluminium nitrate S.. and S 2 (one may be devoid of aluminium and is then a zero standard solution) and are connected via valves 5 and 6 with the conduit 1.
  • Valve 7 in conduit 1 controls the flow of the stream of sampled water.
  • Reservoir 8 contains a standard sodium fluoride solution, say 5 mil ⁇ ligrams of fluoride ions per litre, buffered to a pH of between 4.5 and 5.0 with an acetic acid/sodium acetate buffer.
  • Reservoir 8 is connected via conduit 9 with a confluence 10 where conduits 1 and 9 join.
  • Conduits 1 and 9 pass collaterally through a peristaltic pump 11 upstream of the confluence 10 and as the conduits where they pass through the pump 11 are flexible tubes of identically sized bores, the effect of the pump 11 is to deliver equal volumes of liquids through the conduits 1 and 9 to the confluence 10.
  • Downstream of the confluence 10 the mixed liquid is contained in the conduit 1, passing through a heated block 12, which imposes a temperature of 45°C on the mixed liquid, and into operative contact with a reference electrode 13 and a fluoride ion selective electrode 14, the electrodes 13 and 14 being electrically connected via an active ion meter 15.
  • the active ion meter comprises a millivolt meter, and a microprocessor/random access memory circuit to cope, by known methods, with retaining the datum calibration voltages established experimentally and to carry out the calculation.
  • the equipment With the valve 7 open, the equipment is in its analy ⁇ tic mode and the sample stream is metered by the pump 11 into contact with a metered flow of the buffered standard fluoride solution.
  • the mixed liquid thus formed passes through the heated block 12, attaining a temperature of 45°C and shortly thereafter (e.g. five minutes later) comes into operative contact with the electrodes 13 and 14.
  • Changes in the logarithm of concentration of aluminium in the sampled water are directly related to electropositive changes in the EMF appearing between the electrodes 13 and 14 and such changes are translated electronicall into a direct read out on the recorder 17 of the aluminium con ⁇ centration in the sampled water.
  • Figure 2 shows a modified form of equipment and, where appropriate the same reference numerals as have been used in Figure 1 are employed. The main features of difference between the Figure 1 and Figure 2 arrangements are:
  • a digester coil 20, a reactor coil 21 and a cell 22 are immersed in a common heated water bath 23.
  • An interface output 24 (e.g. to RS 232) is provided on the meter 15.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth 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)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

La teneur en aluminium d'une source d'eau potable est déterminée par un procédé qui consiste à transformer l'aluminium contenu dans un courant échantillon d'eau en un complexe auquel est ajouté du fluorure et à détecter la teneur en fluorure électriquement. Un équipement de réalisation du procédé de la présente invention comprend un organe (10) servant à mélanger un courant échantillon (en 1) avec une solution de fluorure de sodium standard (en 9), à le chauffer (en 12) et à détecter la différence de potentiel créee entre les électrodes (13 et 14). Des solutions dont la concentration d'aluminium est connue peuvent être extraites des réservoirs (3 et 4) pour permettre le calibrage de l'électrode sélective aux ions fluorure (14).
EP19890902062 1988-01-29 1989-01-27 Analyse de l'aluminium contenu dans de l'eau potable Ceased EP0352319A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888802069A GB8802069D0 (en) 1988-01-29 1988-01-29 Assaying aluminium in drinking water
GB8802069 1988-01-29

Publications (1)

Publication Number Publication Date
EP0352319A1 true EP0352319A1 (fr) 1990-01-31

Family

ID=10630775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890902062 Ceased EP0352319A1 (fr) 1988-01-29 1989-01-27 Analyse de l'aluminium contenu dans de l'eau potable

Country Status (5)

Country Link
EP (1) EP0352319A1 (fr)
AU (1) AU600194B2 (fr)
DK (1) DK463389A (fr)
GB (1) GB8802069D0 (fr)
WO (1) WO1989007266A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH597901A5 (fr) * 1975-01-23 1978-04-14 Aligena Ag
DE2624204C3 (de) * 1976-05-29 1980-02-28 Hoechst Ag, 6000 Frankfurt Methode zur quantitativen Bestimmung von Al-C- und Al-H-Bindungen in Kohlenwasserstoffen
FR2524641A1 (fr) * 1982-04-01 1983-10-07 Lyonnaise Eaux Eclairage Appareil pour la preparation d'echantillons destines au controle de la qualite d'une eau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8907266A1 *

Also Published As

Publication number Publication date
GB8802069D0 (en) 1988-02-24
DK463389D0 (da) 1989-09-20
WO1989007266A1 (fr) 1989-08-10
DK463389A (da) 1989-09-20
AU3041889A (en) 1989-08-25
AU600194B2 (en) 1990-08-02

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Legal Events

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