Fritted glassware

Caution. The residues on the glassware and the frit may contain sodium-potassium alloy and/or tris(trimethylsilyl)arsine and should not be exposed to air until disposal. tert-Butyl alcohol and isopropyl alcohol can be used to destroy these pyrophoric compounds however, this should be performed in a fume hood, as arsine gas may be generated. The solid on the frit can be mixed with class D metal fire extinguisher and subsequently treated with either of the aforementioned alcohols. 

You can make a liquid-membrane ion-selective electrode with glassware and chemicals available in most laboratories. All you need are a pH meter, a pair of reference electrodes, a fritted-glass filter crucible or tube, trimethylchlorosilane, and a liquid-ion exchanger. 

Fig. 1. Glassware for photolysis. A, quartz tube (dimensions in millimeters) B, 24/40 quartz inner member joint (available from Ace Glass) C, fritted glass filter (Ace Glass No. 7205-18 porosity D (10-20/r).

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