Nuclepore 0.1 micron filter paper

Example 3

Nitroprusside Reagent Solution

A 20% by weight sodium nitroprusside reagent solution is prepared by dissolving 125 g of sodium nitroprusside in 500 ml of deionized water. An amount of 0.9 ml of 20% sodium nitroprusside solution is mixed to a 100 ml sample of ALDOX V desmutting solution having a copper ion concentration of greater than 350 ppm. (BONDERITE C-IC ALDOX V Aero, Henkel Corporation 32100 Stephenson Highway, Madison Heights, Mich.). The combined solution is mixed vigorously by hand with a glass rod for 10 seconds. The combined solution is then delivered through a filter media using a Buchner funnel. The filtering media is a pre-wetted Whatman Nuclepore 0.1 micron filter paper (under vacuum). The precipitate is removed and visual inspection of the filtered combined solution after 24 hours revealed no further precipitate. Copper concentration in the ALDOX V before and after reaction with the 20% sodium nitroprusside solution reagent is measured with an inductively coupled plasma (ICP) mass spectrometer.

Example 2

Ferrocyanide Reagent Solution

A 20% by weight potassium ferrocyanide reagent solution is prepared by dissolving 125 g of potassium ferrocyanide, in 500 ml of deionized water. An amount of 0.9 ml of 20% potassium ferrocyanide solution is mixed to a 100 ml sample of ALDOX V desmutting solution having a copper ion concentration of greater than 350 ppm (BONDERITE C-IC® ALDOX V Aero, Henkel Corporation, 32100 Stephenson Highway, Madison Heights, Mich.). The combined solution is mixed vigorously by hand with a glass rod for 10 seconds. The combined solution is then delivered through a filter media using a Buchner funnel. The filtering media is a pre-wetted Whatman Nuclepore 0.1 micron filter paper (under vacuum). The precipitate is removed and visual inspection of the filtered combined solution after 24 hours revealed no further precipitate. Copper concentration in the ALDOX V before and after reaction with the 20% potassium ferrocyanide solution reagent is measured with an inductively coupled plasma (ICP) mass spectrometer.