An inexpensive magnetic stirrer

Ellis, J.; Kanamori, Satoshi

doi:10.1021/ed050p137

Cited by 9 publications

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“…The major motivation in the development of a low-cost magnetic stirrer with hot plate is to provide an inexpensive, yet just as effective, alternative to commercially available units. There are other reports in literature on the assembly of magnetic stirrers, − hot plates, , and magnetic stirrers with hot plates. − Our work adds to this body of knowledge by describing a way of building both heating and nonheating magnetic stirrers from recycled electronic wastes such as computers. This addresses the United Nations Environment Programme report that states that every year, 20 to 50 million tons of electronic wastes are generated worldwide, which includes at least 500 million obsolete computers in the U.S.A. between 1997 and 2007 .…”

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confidence: 87%

Low-Cost Magnetic Stirrer from Recycled Computer Parts with Optional Hot Plate

2014

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Magnetic stirrers and hot plates are key components of science laboratories. However, these are not readily available in many developing countries due to their high cost. This article describes the design of a low-cost magnetic stirrer with hot plate from recycled materials. Some of the materials used are neodymium magnets and CPU fans from discarded computers and recycled electrical components from old circuit boards. This prototype was compared with a commercial magnetic stirrer with hot plate. It was noted that high temperatures were reached at similar rates, and the stirring speed was also comparable between the two. With this prototype, which costs 80% less than commercials ones, magnetic stirrers with hot plate can be readily available to enhance teaching and learning in science laboratories that need them most.

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confidence: 87%

Low-Cost Magnetic Stirrer from Recycled Computer Parts with Optional Hot Plate

2014

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“…Ten replicate titrations on a uniform sample of distilled water saturated with oxygen showed a standard deviation of 0.3%. When the titration apparatus is used in conjunction with a battery-powered magnetic stirrer (Ellis and Kanamori 1973) it affords a rapid and effective field method. The optimum concentration of alkaline tartrate reagent depends on the salinity (hardness) of the water, and the method…”

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confidence: 99%

An evaluation of the Miller method for dissolved oxygen analysis

Ellis

Kanamori

1973

Limnology & Oceanography

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The Miller and Winkler methods for dissolved oxygen determination are compared over a range of salinities and oxygen levels. By performing the Miller titration using a capillary sidearm flask, atmospheric oxygen may be excluded and a precision of ± 0.05 mg O2 liter−1 obtained. The Miller end point is highly dependent on pH and on the ratio of sodium hydroxide to sodium potassium tartrate, so that carefully standardized conditions must be used to obtain accurate and reproducible results.

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“…Many Journal of Chemical Education reports were dedicated to the construction of low-cost magnetic stirrers. − The most recent articles describe building strategies from used computer parts. , However, we present in this article guidelines for restoration of magnetic stirring hot plates. Our strategy is to reuse the strong shaded pole motors commonly found in commercial applications.…”

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confidence: 99%

Teaching Students How To Troubleshoot, Repair, and Maintain Magnetic Stirring Hot Plates Using Low-Cost Parts or Repurposed Materials

Paula

Ruggiero

2018

J. Chem. Educ.

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Considering the large number of magnetic stirring hot plates that are damaged or unused in chemical laboratories, this Technology Report presents guidelines for students to be able to diagnose problems, and repair and maintain magnetic stirring hot plates using common and low-cost parts, or even repurposed materials. In addition, this paper presents a control board for stirring or heating with a circuit that uses the triode for alternating current BTA08, as well as various suggestions for refurbishing, maintaining, and replacing parts. Guidelines are provided for diagnosing equipment and conducting a cost analysis to determine the economic viability of proposed maintenance and repair approaches.

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An inexpensive magnetic stirrer

Abstract: Constructing a portable magnetic stirrer from an automobile windshield wiper motor.

Cited by 9 publications

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Low-Cost Magnetic Stirrer from Recycled Computer Parts with Optional Hot Plate

Low-Cost Magnetic Stirrer from Recycled Computer Parts with Optional Hot Plate

An evaluation of the Miller method for dissolved oxygen analysis

Teaching Students How To Troubleshoot, Repair, and Maintain Magnetic Stirring Hot Plates Using Low-Cost Parts or Repurposed Materials

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