How to Ensure Quality Control with CO2 Analytical Support

Written by Leanne Merz

Continued from page 1
•Your CO2 supplier should provide certification and analysis indicating compliance with commercial quality standards, such as ISBT,repparttar International Society of Beverage Technologists •Your quality assurance service company should haverepparttar 136551 resources available to create custom gas mixtures for CO2 ingredient quality control. Typical components include (but are not limited to)repparttar 136552 following: Methane Ethane Ethanol Dimethyl Ether Ethyl Acetate Methanol AmmoniaNitric Oxide Nitrogen Dioxide Carbonyl Sulfide Acetaldehyde BenzeneCyclohexane Ethylbenzene Diethyl Ether Toluene m-Xylene p-Xylene o-Xylene •Preparing two sets of gas mixtures should be standard procedure for your chosen service company, with double analysis of each set to check for minor component stability, and guarantee a shelf life forrepparttar 136553 components. •To further assure accurate results, your service company should identify inaccuracies and verify analytical processes by having participant labs analyze blind internal audit standards. •Your service company should furnish a report to your company's quality control department detailing analytical results, including a statistical representation ofrepparttar 136554 performance of each participant laboratory. •Membership inrepparttar 136555 International Society of Beverage Technologists (ISBT) Quality Committee, Carbon Dioxide Subcommittee, should be maintained in order to keep abreast of emerging analytical methods and technologies withinrepparttar 136556 beverage industry. •Top ofrepparttar 136557 line service companies will provide CO2 Cross–Referencing Services to confirmrepparttar 136558 accuracy of critical analytical processes. These programs provide beverage manufacturers with a reliable and objective method of monitoringrepparttar 136559 performance of multiple laboratories who qualify carbon dioxide used in carbonated beverages as well as confirm ingredient quality. Cross-Referencing Service should be considered in order to: oAchieverepparttar 136560 highest degree of confidence inrepparttar 136561 accuracy of analyses; oConfidentially identify inconsistencies or other problems in analytical processes; and oMaintain reliable and accurate intra-company quality assurance. •Most importantly, make surerepparttar 136562 service company has top rate Internal CO2 Audit Standards to meetrepparttar 136563 most demanding accuracy requirements for virtually any type of customized mixture and that a Certificate of Accuracy is provided for each cylinder. By choosing a Quality Control Specialty Gas Service carefully, your company can be sure to keep pace withrepparttar 136564 ever-expanding list of regulations -- and quite possibly gain an even larger piece of this multi-billion dollar pie.

Leanne Merz is Director of e-Commerce and Technical Services of Scott Specialty Gases, a leading global manufacturer of specialty gases located in Plumsteadville, PA. More information on the company can be found at

How Specialty Gases Differ from Industrial Gases

Written by Bob Davis

Continued from page 1

Laboratory analysis to quantify all components and impurities in a specialty mixture is nearly always critical. A formal document known as a Certificate of Accuracy or Certificate of Analysis is provided for each cylinder containing a specialty mixture, and also for some specialty pure gases. This certificate specifiesrepparttar concentration values for all contents, as well as other important information suchrepparttar 136550 method of blending, type of laboratory analysis and reference standard used to preparerepparttar 136551 mixture and expiration date. Expiration date refers torepparttar 136552 length of timerepparttar 136553 components of a mixture remain at their certified concentrations withinrepparttar 136554 specified tolerances. Depending onrepparttar 136555 stability ofrepparttar 136556 components, shelf life can vary from as little as six months to two years or more. Special cylinder preparation processes, such as Scott’s Aculife cylinder inerting treatments, can be used to condition cylinder interior walls in order to extend a mixture’s shelf life.

Specialty gases are typically not used in nearly as large a quantity as industrial gases and are supplied in steel or aluminum high-pressure cylinders containing up to 3000 pounds of pressure per square inch/gauge (psig). Hence, they are sometimes referred to as cylinder gases or bottled gases. The cylinder itself is typically not included inrepparttar 136557 price ofrepparttar 136558 specialty gas it contains and must be returned torepparttar 136559 gas supplier whenrepparttar 136560 gas has been depleted. A nominal monthly cylinder rental is usually charged untilrepparttar 136561 cylinder is returned. Many specialty gases are also available in small, portable and non-returnable cylinders such as Scott’s SCOTTY Transportables. Other specialized containers include lecture bottles that are often used in laboratories and floating piston-type cylinders that are used to contain volatile liquid phase mixtures.

The cost of specialization Due to blending technology, cylinder preparation, laboratory analysis and statistical quality control necessary to produce specialty gases, cost is much higher than for lower grade industrial gases. An A-size cylinder containing 218 cubic feet of a low grade of helium suitable for filling party balloons might cost little more than $50. The same cylinder containing 99.9999% pure research grade helium, with a total impurity of less than one part-per-million (1 ppm), would cost about $500. That’s still a bargain considering 144 cubic feet of a three-component EPA Protocol mixture having an analytical accuracy of 1% may cost as much as $1,500. As with any other specialized product,repparttar 136562 end cost of a particular specialty pure or gas mixture is largely determined byrepparttar 136563 degree of difficulty and complexity involved in its preparation.

Considerations when purchasing specialty gases Purchasing specialty gases can be a daunting task. Because of today’s bottom line-oriented business climate, one might consider selecting a specialty gas product based strictly on price. Be careful! While in some cases organizations such asrepparttar 136564 EPA may dictate minimum accuracy and manufacturing processes for certain gas mixtures, there are few industry-wide standards for specialty gas quality. Blending, analytical and cylinder preparation procedures vary between suppliers of specialty gases. Moreover, suppliers do not always use common nomenclature when describing their products. Even when product names arerepparttar 136565 same,repparttar 136566 characteristics ofrepparttar 136567 gases can be quite different. The best advice is to carefully evaluate your application needs before purchasing. Then talk with a specialty gas expert to be sure you fully understand howrepparttar 136568 characteristics of a particular pure gas or gas mixture will either meet or possibly compromise your application. Remember also that most specialty gases requirerepparttar 136569 use of specialized delivery equipment that is constructed of materials that will protect gas purity and integrity.

Bob Davis is the Environmental Marketing Manager with Scott Specialty Gases, the world’s largest producer of EPA Protocol gases and a leading global manufacturer of specialty gases for all types of applocations. More information on the company and Scott’s products can be found at

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