Leaf, color complete

Determination of lead on leaves. For each plastic bag containing a leaf sample, heat 20 mL of 0.1 M HNO3 to about 70°C. Add 20 mL to each bag, close, and shake for about 2 min. Pour into clean 100-ml- beakers. Add one drop thymol blue indicator solution to each, followed by dropwise addition of 2 M NH3 until the indicator color change is complete (to blue) and add a couple of extra drops. The solution should smell of ammonia. Then, add only if instructed to) 60 mL of the ammonia-cyanide-sulfite solution—and then add with a pipet 25 mL of the CH2Cl2-dithizone solution and proceed with the extraction measurement as with the standards. 

The implementation of the heat exchanger was done after starting the furnace operation. The glass color was changed several times without any impact on furnace stability. Even very redox- sensitive colors like amber and dead leaf were successfully produced. The expected reduction in oiergy consumption was achieved. The dusting inside the furnace was checked by measurements. The ambient around the furnace was completely dust free. The facility is air dense. 

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