Hach Method 651
Margaret Sieverding
Products. Support. Expertise. Hach provides the right solution for your specific application. With almost a decade of experience delivering the right solutions and the greatest number of EPA approved methods, Hach is your trusted partner in water analysis.
These methods may be used for compliance monitoring. They have either obtained an EPA Approval or Acceptance letter, or the method is a packaged product that follows an EPA Reference method and is deemed Equivalent by Hach. With any method used for compliance reporting, always consult with your local regulatory authority.
The EPA has evaluated and approved new technological methods developed by Hach Company. All EPA Approved methods are cited in the Federal Register and compiled in the Code of Federal Regulations at 40 CFR 136 and CFR 141.
The EPA has reviewed Hach methods and accepted them for use in compliance monitoring. These methods are defined by EPA as Acceptable versions of previously approved methods. These methods are generally not published in the Federal Register or in the Code of Federal Regulations. A facsimile of the EPA Acceptance letter is available upon request.
All EPA Approved methods have specification criteria built into their procedural steps. When an approved or accepted EPA method has been packaged by Hach from the EPA reference method as a test method that meets or exceeds these specification criteria, these methods are deemed to be equivalent for use in EPA compliance monitoring (40 CFR 136.6). EPA does not normally issue equivalence letters for packaged reference methods.
The Water Analysis Handbook (WAH) is the result of more than 85 years of research and method development. With over 300 illustrated, step-by-step instructions, this is your comprehensive source for water analysis procedures. From instruments to reagents, meters to probes, media to general lab supply, this handbook outlines everything you need to perform each procedure, simplifying the water analysis process.
LOVELAND, CO, Sept. 1, 2006 -- In a letter dated July 26, the U.S. Environmental Protection Agency's Engineering and Analytical Support Branch recommended Hach LDO Method 10360 (Luminescence Dissolved Oxygen) for the measurement of DO and the determination of biochemical oxygen demand (BOD) in wastewater, under the National Pollution Discharge Elimination System Program (NPDES).
The Hach LDO method is a breakthrough in the measurement of dissolved oxygen. For many facilities around the world, Hach LDO has become the standard for measuring dissolved oxygen by eliminating the numerous reliability and maintenance concerns inherent in older DO measurement technologies. The LDO probe has no membranes to clean or replace, no electrolyte solution to replenish, and reduces calibration frequency.
In response to growing customer dissatisfaction with traditional membrane DO technologies, Hach Company was the first to bring its patented LDO technology to market. The Hach LDO technology, first introduced more than three years ago, has been delighting thousands of customers around the globe.
On Jan. 3, the EPA approved ASTM Standard D888-05, which includes the LDO method. The EPA's most recent letter reinforces its recommendation of the Hach LDO method. As a result of the letters issued from the EPA in January and July, many states and EPA regions are authorizing use of the Hach LDO method for BOD analysis and DO effluent monitoring.
The Hach Company (www.hach.com) is based in Loveland, CO, and is a subsidiary of Danaher Corp. The company is a global leader in the development, manufacture, marketing, and support of laboratory, online, and on-site water quality analysis solutions.
Hach Company manufactures and distributes analytical instruments and reagents used to test the quality of water and other liquid solutions. Manufactured and distributed worldwide, Hach systems are designed to simplify analysis by offering on-line instrumentation, portable laboratory equipment, prepared reagents, easy-to-follow methods, and technical support.[1]
The company was originally a partnership. In 1968, it was reincorporated in Delaware as Hach Chemical Co., with Clifford Hach president and treasurer and Kathryn Hach as vice-president.[5] Later that year Hach went public, raising $1.7 million with the sale of a small minority of the shares. Most of the money was used to build and equip a new chemical manufacturing plant in Ames.[5]
In 1970, Hach was manufacturing and marketing a line of instruments designed to determine specific water impurities. It was also manufacturing a manometric apparatus that measured the biochemical oxygen demand (BOD) of sewage and industrial wastes in lakes, rivers, and streams.[5]
In 1977, Clifford Hach took the position of chairman and chief executive officer, and Kathryn Hach became president and chief operating officer the following year. In 1978, Hach moved its instrument division and its corporate headquarters to Loveland, Colorado. Hach Chemical Co. became Hach Company in 1980.[5]
In 1985, Clifford Hach was chairman; Kathryn Hach was vice-chairman; and Stelios Papadopoulos was president of the company, which had grown to 580 employees.[6] At that time, the company was being offered for sale at 50 million dollars.
Analytical instruments continue to be manufactured in Loveland, Colorado, where Hach also has its corporate headquarters, research, development, and engineering operations, Technical Training Center, and plastic component manufacturing operation. The chemical manufacturing operations, a chemical research laboratory, and the company warehouse and shipping operations are still in Ames, Iowa.[3]
In 1998, Hach expanded its portable testing capabilities with the acquisition of Environmental Test Systems Inc., in Elkhart, Indiana (USA). ETS develops, manufactures and markets diagnostic test strips for both consumer and industrial applications. ETS operations continue to be based in Elkhart.[4]
Also in 1999, the company acquired the German manufacturer Lange, and established additional product development and manufacturing in Dsseldorf.[4] Lange, founded by Dr. Bruno Lange, is the distribution and support center for Hach's customers in Europe and Mediterranean Africa.[4] Danaher acquired Lange, Hach, and numerous other brands, and a period of dramatic change occurred for each brand as lean production was introduced.
Die Einteilung nach Widmer hat sich weltweit durchgesetzt. Ihr be-stechender Vorteil liegt in der Praktikabilitt, weil sie nur auf optischen Vernderungen der Haut beruht. Fr die differenzierte Chirurgie der Fascia cruris mit mehreren verschiedenen Operationsmethoden reichen aber die Widmer-Kriterien nicht mehr aus.
Das Prinzip der Klassifikation nach Hach beruht auf dem Nachweis und der Ausdehnung der Haut- und Gewebesklerose als einem dominierenden Symptom des chronischen vensen Stauungssyndroms. Dabei wird das neue theoretische Konzept des chronischen vensen Kompartmentsyndroms zugrunde gelegt. Hieraus lassen sich dann unmittelbar auch die chirurgischen Konsequenzen ableiten.
The MetalTrace method, which consists of an anion-exchange separation coupled with a spectrophotometric quantification, was used to determine lead and cadmium in sulfuric acid-hydrogen peroxide digests of soils and sludges and hydrobromic acid extracts of soils. Cadmium only was determined in sulfuric acid-hydrogen peroxide digests of fertilizers because no standards were available with certified lead contents. The selectivity provided by the anion-exchange separation allowed the use of a spectrophotometric indicator with an extremely high extinction coefficient so that detection limits in the low parts per million range could be attained. The results obtained using this method compared favorably with those obtained using much more expensive methods requiring more specialized training and equipment.
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