For repeatable accuracy in environmental analysis, select the reagents with actual analytical values on the label Β lb.
5-3780 Sodium Nitrite Crystal
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You receive useful information for repetitive work, for assessment of blank values, and for reference in evaluating test results 696 A • ANALYTICAL CHEMISTRY, VOL. 46, NO. 8, JULY 1974
You receive actual values for key impurities, which saves you time and money by eliminating the need to determine these values yourself
Here's actual proof-of-performance In these verbatim statements, professionals tell why they specify 'Baker Analyzed'® Reagents for today's increasing demand in environmental analysis: Advanced Instrumental Techniques "As a neutron activation analysis specialist in the environmental field, my accuracy problems associated with unknown contamination of elemental NAA standards are unique. Exact analysis of the impurities in a reagent enables calculation of interferences in standards, and in turn produces accurate environmental data." Primary Standards "Maximum accuracy of extremely small variations of environmental pollution data over a period of years is needed in interpreting pollutional trends. Baker's actual analysis and identification of each batch of reagents with a lot number enables the achievement of interlaboratory and intralaboratory quality control objectives concerned with environmental pollution standards, controls, and legal requirements. This is of salient importance when reagents are used as primary standards." Water Analysis "In the analysis of water and wastewater for trace quantities of nitrite nitrogen, the Phenoldisulfonic acid method is sensitive to 1 microgram, provided there are no interferences. In the preparation of the reagent, made from phenol and sulfuric acid, this laboratory has found it necessary to designate only 'Baker Analyzed' phenol, in order to obtain a clear, colorless reagent." Arsenic Determination "Our analytical procedures involve determination of microgram quantities of materials. In arsenic determinations, for instance, we must be confident of the Baker assay and the amount of arsenic as stated on the label. The actual analysis of Baker's reagent grade chemicals listed for each lot number is one of the well known, reliable reports of the chemical analysis trade."
Critical Trace Element Analysis "Work with trace amounts of metal salts are of no value unless purity is assured. That's why, for all our delicate, sensitive environmental work, we always have peace of mind with a 'Baker Analyzed' Reagent. It makes sense to use the best there is. 'Why have any more variables than necessary?' For our important work, we always choose Baker, hands down." Lead Determination "Furthermore, in using spectrophotometric methods (such as the determination of trace lead in petroleum products) which require treatment of samples with many reagents—reagents which must be pre-purified of interfering substances—it is both time saving and more accurate to use 'Baker Analyzed' chemicals of highest purity to minimize reagent purifications steps."
No other manufacturer labels laboratory products like Baker does. Compare the points of test, and the actual lot analysis on the label at left, with the label on any other brand of reagent grade Sodium Nitrite in your lab, and you'll see what we mean. You can put your confidence in 'Baker Analyzed' Reagents, when you need top performance in your critical work. You can also expect fast deliveries, when you
specify Baker reagents because we take as much care with service as we do with quality. There's $15,000,000 worth of Baker lab chemicals in stock, and over 100 convenient distributor locations to get supplies to you fast and efficiently . . . one is sure to be close to your lab. For more information, or to order'Baker Analyzed' Reagents, contact your local J.T. Baker distributor or write: J.T. Baker Chemical Co., 222 Red School Lane, Phillipsburg, N.J. 08865.
Environmental Studies "The analysis is useful in my air and water pollution studies and nutritional studies on bacteria. The chemicals used in these studies must be ultrapure and trace elements present in the chemicals must be known. After casually examining the chemicals in my office I found 20 bottles that were purchased from J.T. Baker Company and the information available on these labels was far superior to the labels on Brand X." Meeting Regulatory Controls "I am constantly performing chemical analyses relative to local federal regulations, court litigation, ecology health hazards and numerous other critical tests where an actual known amount of purity plus impurities in a given chemical are so essential, that I not only realize the importance of the actual numerical values on the 'Baker Analyzed' label, but I consider it an absolute 'MUST'."
In environmental analysis the professional chooses J.T Baker
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CIRCLE 24 ON READER SERVICE CARD
A N A L Y T I C A L CHEMISTRY, VOL. 46, NO. 8, JULY 1974 • 697 A
