Environmental Express MicroBlock-R System with Ammonia Glassware; 240V

C5201-240 MicroBlock™-V, Block Only, 240 VAC

(adjustable digital temperature control with LCD readout and timer, Includes a flow meter to monitor cooling water rates)

7.0 PROCEDURE
7.1 Preparation of distillation glassware. Steam out the distillation glassware using 50mL reagent water with a pinch of
boiling chips until no trace of ammonia can be detected.
7.2 If residual chlorine is present add sodium thiosulfate or sodium sulfite equivalent to the chlorine level.
7.3 To a 50mL sample add 1N NaOH drop-wise with mixing and adjust to pH 9.5.
7.4 Transfer sample to the Reaction Tube, skirted, and add 2.5mL of borate buffer followed by a pinch of boiling chips.
7.5 To the Receiver Tube add 5-10mL of 20g/L Boric Acid or 0.2N H2SO4. If using the Snip & Pour concentrate pour the
entire contents of the tube in the Reaction Tube. The tip of the long stem must be below the level of boric acid or
sulfuric acid.
7.6 Repeat for all samples to be distilled up to a maximum of 10.
7.7 Assemble the distillation glassware setup as shown in Figure 3.
7.8 Turn on the tap water to cool the Cold Finger after ensuring all tubing connections are tight. Check for any leaks.
7.9 Turn the power ON and set heater block temperature to 190°C and the timer to 60 minutes.
7.10 Collect a minimum of 30mL of distillate.
7.11 Turn power OFF.
7.12 Unscrew the cap holding the Long Stem in the receiver tube and remove from all distillation positions to prevent
any suck back of the distilled sample. When the Long Stem is disconnected, gently let it rest at the bottom of the
Receiver Tube.