Look in curezone the subject: Food that kills. In the list is written baking soda. But if you go to:
www.curezone.com/clark/ph.asp
You will find that Dr. CLark mentioned not to use baking soda from a store because most brands she has tested are polluted with benzene! I think that is what the persone above was trying to say.
Dr. Clark recomends a combination of sodium and potassium bicarbonate in a ratio of 2:1. Read her article for more details.