Real-time toxic metals monitor device and method
First Claim
1. A device for monitoring the concentration of toxic metals in workplace air, comprising a monitor cell comprising a base and a removable assembly, wherein(a) said removable assembly comprises (1) a flat, electrically insulating substrate having a first surface, (2) an electrolyte cell having an anode and a cathode disposed on said first surface, said anode and cathode spaced apart to define a controlled volume for holding a quantity of an electrolyte, and (3) means for applying a controlled electrical potential to said cathode of said electrolyte cell;
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Accused Products
Abstract
An device for monitoring workplace air comprises a monitor cell comprising a base and a removable assembly. The removable assembly comprises (1) a flat, electrically insulating substrate having a first surface, (2) an electrolyte cell having an anode and a cathode disposed on the first surface, the anode and cathode spaced apart to define a controlled volume for holding a quantity of an electrolyte, and (3) means for applying a controlled electrical potential to the cathode. The base comprises (1) an air inlet portion for sampling air, (2) an air outlet portion connected to an air sampling pump, (3) a channel connecting the air inlet and the air outlet and adapted to introduce air to the electrolyte in the electrolyte cell, (4) a reservoir for storing the electrolyte for the electrolyte cell, and (5) a wick for supplying electrolyte from the reservoir to the electrolyte cell.
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Citations
19 Claims
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1. A device for monitoring the concentration of toxic metals in workplace air, comprising a monitor cell comprising a base and a removable assembly, wherein
(a) said removable assembly comprises (1) a flat, electrically insulating substrate having a first surface, (2) an electrolyte cell having an anode and a cathode disposed on said first surface, said anode and cathode spaced apart to define a controlled volume for holding a quantity of an electrolyte, and (3) means for applying a controlled electrical potential to said cathode of said electrolyte cell; - and
(b) said base comprises (1) an air inlet portion for sampling air, (2) an air outlet portion connected to an air sampling pump, (3) a channel connecting said air inlet and said air outlet and adapted to introduce said air to said electrolyte, (4) a reservoir for storing said electrolyte for said electrolyte cell, (5) wick means for supplying said electrolyte from said reservoir to said electrolyte cell and (6) wick means for providing contact between said air and said electrolyte in said channel whereby said toxic metals dissolve in said electrolyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for monitoring the concentration of toxic metals in workplace air breathed by personnel comprising:
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(a) obtaining a sample of said workplace air; (b) providing a monitor cell comprising (1) an electrolyte cell having an anode and a cathode spaced apart a controlled volume filled with an electrolyte, (2) an electrolyte reservoir for storing said electrolyte and means for supplying said electrolyte to said electrolyte cell, and (3) means for applying a controlled electrical potential to said cathode of said electrolyte cell; (c) forming a solution of any said toxic metals in said electrolyte; (d) controlling said electrical potential of said cathode of said electrolyte cell such that hydrogen is evolved at said cathode at a current between about 10-4 and 1 amp per square centimeter; (e) poisoning at least one catalytic site on said cathode for said evolution of hydrogen by an amount of at least one toxic metal atom plating out of said solution in said electrolyte cell onto said cathode; (f) monitoring in real time said amount of said toxic metal plating out of said solution onto said cathode by detecting a change in said current flow; (g) determining a measure of said toxic metals from said change in said current flow and comparing said measure to a safety standard for airborne levels of said toxic metals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification