Centre for Science and Environment - http://www.cseindia.org/index.html released a study report regarding colas

• A cocktail of three to six pesticides found in all samples



• Lindane — a confirmed carcinogen — was found at an average concentration of 5.5 ppb, which is 54 times higher than the BIS standard (finalised but not notified) for individual pesticides in soft drinks (0.1 ppb)



• In one sample of Coca-Cola bought in Kolkata, lindane was as high as 14 ppb, which is 140 times higher than the BIS standard



• Chlorpyrifos, a known neurotoxin also known to breach the placenta, was found in all samples at an average concentration of 4.8 ppb, which is 47 times higher



• A Coca-Cola sample bought in Mumbai, manufactured in Thane, contained 20.4 ppb of chlorpyrifos: this is 200 times higher than the BIS standard for an individual pesticide. Heptachlor, banned in India, was found in 71 per cent of the samples, at levels which are four times the BIS standards



• The average amount of pesticide residues found in all samples was 11.85 ppb, which is 23 times higher than the BIS standards for total pesticides in soft drinks (0.5 ppb)
  Pepsi Cola, the flagship brand of PepsiCo India, on an average contained 15.2 ppb pesticide residues; this is 30 times the BIS standards. Coca-Cola, the flagship brand of Coca-Cola India, on an average contained 13.4 ppb pesticide residues; this is 27 times the BIS standards



• The average pesticide residues in all brands of PepsiCo was 12.7 ppb. This is 25 times the BIS standards



• The average pesticide residues in all brands of Coca-Cola India was 11.05 ppb. This is 22 times the BIS standards
  

See this report from CSE http://www.cseindia.org/misc/cola-indepth/cola2006/health_effects.htm