Tested disposal methods for chemical wastes from academic laboratories

Armour, Margaret-Ann; Browne, Larry M.; Weir, G. L.

doi:10.1021/ed062pa93

Cited by 10 publications

(6 citation statements)

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“…This practice has now been largely discontinued in favor of other types of cleaning solutions that do not contain chromium ions. Insoluble chromium hydroxide is formed by reduction of the dichromate with sodium thiosulfate solution 5,6 . The efficiency of the reduction and the formation of the product as an easily handled flocculent precipitate rather than as a gel is dependent upon the pH of the solution.…”

Section: Methods For the Disposal Of Some Heavy Metal Saltsmentioning

confidence: 99%

Protecting Health

Armour

Linetsky

Ashick

2008

Annals of the New York Academy of Sciences

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Water-soluble heavy metal salts injure health when they leach into water supplies. It is important that students who may later be employed in industries generating aqueous solutions of such salts are aware of the methods that can be used to recover the metal salt or transform it to non-health threatening products. The research was in the management of small quantities of hazardous wastes, such as are generated in school, college, and university teaching laboratories; in research laboratories; in industrial quality control and testing laboratories; and in small industries. Methods for the recovery of silver, nickel, and cobalt salts from relatively small volumes of aqueous solutions of their soluble salts were developed and tested. Where it was not practical to recover the metal salt, the practice has been to convert it to a water-insoluble salt, often the sulfide. This requires the use of highly toxic reagents. It was found that a number of heavy metal salts can be precipitated as the silicates, returning them to the form in which they are found in the natural ore. These salts show similar solubility properties to the sulfides in neutral, acidic, and basic aqueous solutions. The work has determined the conditions, quantities, and solution acidity that result in the most effective precipitation of the heavy metal salt. The concentration of the metal ions remaining in solution was measured by AA and ICP spectrometry. Specific methods have been developed for the conversion of salts of mercury and chromium to nonsoluble products.

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Section: Methods For the Disposal Of Some Heavy Metal Saltsmentioning

confidence: 99%

Protecting Health

Armour

Linetsky

Ashick

2008

Annals of the New York Academy of Sciences

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“…O efluente final deve ser límpido e incolor, ter pH em torno de 7 e apresentar caráter redox indiferente [8,9,19].…”

Section: Introductionunclassified

Gerenciamento de resíduos químicos em um laboratório de ensino e pesquisa: a experiência do Laboratório de Limnologia da UFRJ

et al. 2011

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“…These schools were located in Delaware, District of Columbia, Maryland, New Jersey, Pennsylvania, Virginia, and West Virginia. Departments included [2][3][4][5][6] faculty members in chemistry with support staffs (secretary, stockroom manager) of %-2.…”

mentioning

confidence: 99%

“…The difficulty in getting a large number of faculty and students to follow new and more complex procedures, once established, was also cited. Several recent publications provide relevant information regarding regulations and procedures for dealing with these problems (3)(4)(5).…”

mentioning

confidence: 99%