US3873274A - Titrator - Google Patents

Titrator Download PDF

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Publication number
US3873274A
US3873274A US329022A US32902273A US3873274A US 3873274 A US3873274 A US 3873274A US 329022 A US329022 A US 329022A US 32902273 A US32902273 A US 32902273A US 3873274 A US3873274 A US 3873274A
Authority
US
United States
Prior art keywords
syringe
container
burette
liquid
titrating
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 - Lifetime
Application number
US329022A
Other languages
English (en)
Inventor
Karlheinz Neisius
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.)
Merck Patent GmbH
Original Assignee
Merck Patent GmbH
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
Priority claimed from DE19722204808 external-priority patent/DE2204808C3/de
Application filed by Merck Patent GmbH filed Critical Merck Patent GmbH
Application granted granted Critical
Publication of US3873274A publication Critical patent/US3873274A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/0203—Burettes, i.e. for withdrawing and redistributing liquids through different conduits
    • B01L3/0206—Burettes, i.e. for withdrawing and redistributing liquids through different conduits of the plunger pump type

Definitions

  • ABSTRACT 3 Claims 1 Drawing Figure 3,757,585 9/1973 Heller et a1.
  • a titrating device adapted to be removably air-tight fitted onto a bottle of titrating liquid, comprising a graduated plunger-type syringe, for mounting externally on the bottle by a seal providing air-tight communication with a burette of comparable capacity as the syringe, for mounting in the bottle, so that titrating liquid in the bottle is metered into the burette and does not contact the syringe when the plunger is withdrawn while the tip of the burette is below the surface of the titrating liquid.
  • This invention relates to novel titrating devices.
  • the syringe In order to eliminate the air bubble, which is required in order to calibrate the syringe to the zero point, the syringe must be inverted and a portion of the titrating liquid squirted out of the syringe, which can then run over the fingers of the person using the syringe. This is dangerous, in particular, in case of corrosive or toxic titrating solutions. Moreover, the outside wall of the syringe must then be cleansed in some cases to prevent the inadvertent release of traces of the titrating liquid from the outer wall of the syringe during the titration, which would affect the accuracy of the determination. Consequently, such syringes have not become popular as auxiliary titrating means for rapid determination methods.
  • the titrating device of this invention comprises a graduated plunger-type syringe, adapted for mounting outside a container for a titrating liquid by a hollow sealing means providing an air-tight communication between the syringe and a burette adapted for mounting inside the container by the sealing means to withdraw liquid from the container.
  • the syringe is disposed vertically above the burette.
  • the drawing is a vertical'cross-section of a preferred embodiment of the titrating device of this invention mounted onto a container for the titrating liquid.
  • the embodiment shown in the drawing comprises a plunger-type syringe 1 having a plunger 1a and a barrel with a sleeve-like tubular extension 2a and an annular shoulder 2b; a sealing cap 3 with an axial aperature 3a in its top for a container 4 for the titrating liquid; a bu,- rette 5 with a lip 5a on its upper end and a dispensing tip 7 at its lower end; a transparent plastic tube or sleeve 6 fitted onto the barrel lb of syringe; and a scraper 8 mounted in the mouth 4a of container 4.
  • Syringe l is mounted axially vertically above burette 5 and in indirect air-tight communication therewith by gasket 2 fitted into the mouth of container 411ml, by means of annular shoulder 2b on the upper portion of gasket 2 immediately below extension 2a, over the top of the mouth 4a of container 4.
  • Lip 5a of burette 5 is fitted into the lower end of aperature of gasket 2 so as to be proximate to the lower tip 1d; of barrel lb of syringe 1.
  • Container 4 and cap 3 are threaded so that the syringe assembly can be rigidly mounted on the container, the tightening of the cap forcing the shoulder 2b against the neck 4b of the container 4.
  • plunger 1a of syringe l is first depressed downwardly into barrel lb and thereafter the titrator is fitted onto the storage vessel 4. During this step, the-air trapped in the burette 5 prevents the entrance of titrating liquid into the glass tube 7.
  • plunger la of syringe l is moved upwardly, preferably after screwing cap 3 tightly onto container 4, i.e., partially withdrawn from barrel lb, an amount of liquid corresponding to the change in volume ofsyringe l enters burette 5.
  • the volume of the glass tube forming burette 5 projecting into the titrating liquid in container 4 is preferably equal to or larger than that of the syringe 1 so that no titrating liquid can enter syringe 1, even with a full utilization of the volume capacity of syringe l.
  • the avoidance of any contact between the titrating liquid and syringe 1 is especially of interest when the titration is to be conducted with corrosive liquids, e.g., concentrated acids or bases. In this manner, the lifetime of the syringe l is prolonged, particularly ifthe plunger is provided with a gasket.
  • plunger-type syringe can be employed as syringe 1.
  • syringes of a synthetic resin e.g., polyethylene or -propylene, having a volume of between about 1 ml. and 20 ml.
  • the container 4 can be formed of any desired inert material.
  • a conventional glass or plastic bottle is used.
  • Sealing means 2 can be formed of any material which is resistant to the titrating liquid employed. Suitable materials are, for example, rubber or elastomeric synthetic resins. As stated above seal 2 connects the upper rim of burette 5, which desirably is bent a little outwardly to form a lip a which ensures an air-tight fit, and the lower part of syringe 1 so that an air-tight seal is obtained. Sealing means 2 is disposed within the sealing cap 3. In order to impart extra ruggedness to the apparatus and to ensure an air-tight fit, seal 2 advantageously has a sleeve portion 2a which extends beyond the cap 3 to such an extent that it encloses the lower portion of the syringe l and sleeve 6.
  • Sealing cap 3 can be of any desired shape, for example', a screw cap.
  • the cap need merely form a liquid tight closure for the associated container and must be resistant to the titrating liquid employed.
  • the sleevelike extension 2a of seal 2 projects through aperature 3a of cap 3.
  • Scraper 8 is advantageously mounted within the mouth of the container 4 so that it contacts the outer wall of burette 5.
  • Scraper 8 can be made of cotton wool, glass wool, synthetic resin lips or a similar inert material, depending on the titrating liquid utilized. The only essential point is that the scraper removes any residual titrating liquid which may adhere to the outer wall of burette 5 when the titrator is removed from container 4.
  • Burette 5 suitably terminates at its bottom end in a tip 7 so that the metering accuracy is increased.
  • Burette 5 like the other components of the titrator, can be made of glass or inert synthetic resin.
  • Syringe 1 preferably is arranged vertically above burette 5. Syringe 1 can, however, project at an angle with respect to burette 5, e.g., by forming a bend in sleeve 2a, if this should be advantageous for certain applications. One need only ensure that a tight seal is effected by sealing means 2 providing communication between burette 5 and syringe l.
  • This novel and easily maintained titrator is very suitable for conducting rapid analyses, which methods have gained increasing importance nowadays.
  • a wide field of application is in the analysis of foodstuffs and of water for general use and waste water.
  • the novel titrator are the determination of the total and carbonate hardness in various types of water, the determination of disinfecting chlorine in swimming waters, the determination of the hydrazine content of boiler feed water, the determination of the free and bound sulfurous acid the total acidity of wine, and the determination of free fatty acids in baking shortening.
  • a titrating device comprising a container for a liquid to be titrated, said container having an opening through a neck bearing external threads, separable means for withdrawing said liquid from said container including a burette for depending into said container, 21 graduated plunger-type syringe for standing above said container, and hollow sealing means interconnecting said burette and said syringe in air-tight communication, the volume of said syringe being not substantially greater than the volume of said burette, and said sealing means including an upwardly extending tubular portion having an integral annular ring on the external surface thereof, and a screw cap for mounting on said threaded neck and having an aperture therein for receiving said tubular portion therethrough, said screw cap interacting with the upper surface of said annular ring for forcing the lower surface of said ring against said neck for sealing said separable means with said container.
  • a titrating device according to claim 1 wherein said syringe includes a. cylindrical barrel portion and wherein said device includes a transparent plastic sleeve surrounding the barrel of the syringe and wherein said barrel and said surrounding sleeve are inserted into said upwardly extending tubular portion of said sealing means in an air-tight friction fit.

Landscapes

  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Sealing Of Jars (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
US329022A 1972-02-02 1973-02-02 Titrator Expired - Lifetime US3873274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722204808 DE2204808C3 (de) 1972-02-02 Titriervorrichtung

Publications (1)

Publication Number Publication Date
US3873274A true US3873274A (en) 1975-03-25

Family

ID=5834764

Family Applications (1)

Application Number Title Priority Date Filing Date
US329022A Expired - Lifetime US3873274A (en) 1972-02-02 1973-02-02 Titrator

Country Status (11)

Country Link
US (1) US3873274A (de)
JP (1) JPS4888992A (de)
BE (1) BE794749A (de)
CH (1) CH546096A (de)
DD (1) DD101018A5 (de)
FR (1) FR2170719A5 (de)
GB (1) GB1371312A (de)
IL (1) IL41381A (de)
IT (1) IT978515B (de)
NL (1) NL7300814A (de)
ZA (1) ZA73330B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135866A (en) * 1977-08-29 1979-01-23 Reliance Glass Works Laboratory glassware taper connector system with retainer and backup seal
US4616514A (en) * 1983-06-06 1986-10-14 Rainin Instrument Co., Inc. Replaceable tip assembly for pipette
US4664655A (en) * 1986-03-20 1987-05-12 Norman Orentreich High viscosity fluid delivery system
US4758234A (en) * 1986-03-20 1988-07-19 Norman Orentreich High viscosity fluid delivery system
US4784657A (en) * 1985-10-01 1988-11-15 Ceramed Corporation Syringe-vial material transfer interconnector
WO1989007980A1 (en) * 1988-02-29 1989-09-08 Pharmacia-Eni Diagnostics, Inc. Automatic reagent dispenser
US4982740A (en) * 1986-02-26 1991-01-08 Broden Bengt Inge Method for use in the handling of body fluids
US5133218A (en) * 1989-07-24 1992-07-28 Tritech Partners Sample liquid aspirating and dispensing probe
US5366898A (en) * 1992-03-27 1994-11-22 Dexsil Corporation Method for quantitative determination of total base or acid number of oil
US5800782A (en) * 1994-11-18 1998-09-01 Dexsil Corporation Apparatus for quantitative determination of total base or acid number of oil
WO2004015412A1 (en) * 2002-08-10 2004-02-19 Sohail Hajatdoost Apparatus for quantitative analysis
US20090178725A1 (en) * 2008-01-11 2009-07-16 Troy Sonnier Apparatus for extracting, measuring and transferring fluids
US20100211040A1 (en) * 2009-02-19 2010-08-19 Cetylite Industries, Inc. Apparatus and method for dispensing fluid through a port connector
US11382832B2 (en) * 2017-01-18 2022-07-12 Novartis Ag Dip tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697945A (en) * 1952-08-05 1954-12-28 Dovas Nicholas Suction device for blood diluting pipettes
US3410664A (en) * 1965-10-29 1968-11-12 Navy Usa Titration apparatus
US3660037A (en) * 1970-08-10 1972-05-02 Kurt Rudolf Sokol Device for measuring blood sedimentation rate
US3757585A (en) * 1968-08-16 1973-09-11 Heller Labor Pipette apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697945A (en) * 1952-08-05 1954-12-28 Dovas Nicholas Suction device for blood diluting pipettes
US3410664A (en) * 1965-10-29 1968-11-12 Navy Usa Titration apparatus
US3757585A (en) * 1968-08-16 1973-09-11 Heller Labor Pipette apparatus
US3660037A (en) * 1970-08-10 1972-05-02 Kurt Rudolf Sokol Device for measuring blood sedimentation rate

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135866A (en) * 1977-08-29 1979-01-23 Reliance Glass Works Laboratory glassware taper connector system with retainer and backup seal
US4616514A (en) * 1983-06-06 1986-10-14 Rainin Instrument Co., Inc. Replaceable tip assembly for pipette
US4784657A (en) * 1985-10-01 1988-11-15 Ceramed Corporation Syringe-vial material transfer interconnector
US4982740A (en) * 1986-02-26 1991-01-08 Broden Bengt Inge Method for use in the handling of body fluids
US4664655A (en) * 1986-03-20 1987-05-12 Norman Orentreich High viscosity fluid delivery system
US4758234A (en) * 1986-03-20 1988-07-19 Norman Orentreich High viscosity fluid delivery system
WO1989007980A1 (en) * 1988-02-29 1989-09-08 Pharmacia-Eni Diagnostics, Inc. Automatic reagent dispenser
US4927765A (en) * 1988-02-29 1990-05-22 Pharmacia Eni Diagnostics, Inc. Automatic reagent dispenser
US5133218A (en) * 1989-07-24 1992-07-28 Tritech Partners Sample liquid aspirating and dispensing probe
US5366898A (en) * 1992-03-27 1994-11-22 Dexsil Corporation Method for quantitative determination of total base or acid number of oil
US5800782A (en) * 1994-11-18 1998-09-01 Dexsil Corporation Apparatus for quantitative determination of total base or acid number of oil
WO2004015412A1 (en) * 2002-08-10 2004-02-19 Sohail Hajatdoost Apparatus for quantitative analysis
US20090178725A1 (en) * 2008-01-11 2009-07-16 Troy Sonnier Apparatus for extracting, measuring and transferring fluids
US8171963B2 (en) * 2008-01-11 2012-05-08 Troy Sonnier Apparatus for extracting, measuring and transferring fluids
US20100211040A1 (en) * 2009-02-19 2010-08-19 Cetylite Industries, Inc. Apparatus and method for dispensing fluid through a port connector
US11382832B2 (en) * 2017-01-18 2022-07-12 Novartis Ag Dip tube

Also Published As

Publication number Publication date
IL41381A (en) 1975-08-31
CH546096A (de) 1974-02-28
DD101018A5 (de) 1973-10-12
FR2170719A5 (de) 1973-09-14
IL41381A0 (en) 1973-03-30
IT978515B (it) 1974-09-20
BE794749A (fr) 1973-07-30
DE2204808B2 (de) 1975-11-20
DE2204808A1 (de) 1973-08-09
NL7300814A (de) 1973-08-06
JPS4888992A (de) 1973-11-21
ZA73330B (en) 1973-10-31
GB1371312A (en) 1974-10-23

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