Worth reading- http://en.wikipedia.org/wiki/Hydraulic_fracturing
There are the common additives that account for 0.5%. 90% water, 9.5% sand.
Concentrated hydrochloric acid forms acidic mists. Both the mist and
the solution have a corrosive effect on human tissue, with the potential to
damage respiratory organs, eyes, skin, and intestines irreversibly. Personal protective equipment such as
rubber or PVC gloves, protective eye goggles, and chemical-resistant clothing
and shoes are used to minimize risks when handling hydrochloric acid. The United States
Environmental Protection Agency rates and regulates hydrochloric acid as a toxic substance.Concerns have been raised that polyacrylamide used in agriculture may contaminate food with the nerve toxin acrylamide. While polyacrylamide itself is relatively non-toxic….. there are concerns that polyacrylamide may de-polymerise to form acrylamide. …..California requires (current as of 2010) products containing acrylamide as an ingredient to be labeled with a statement that it is "a chemical known to the State of California to cause cancer."
Ethylene glycol is moderately toxic with an oral LDLO = 786 mg/kg for humans
As a strong disinfectant, glutaraldehyde is toxic and a strong irritant.[7] There is no evidence of carcinogenic activity.
Isopropyl alcohol vapor is denser than air and is flammable …It should be kept away from heat and open flame.[14] Isopropyl alcohol is a skin irritant. Isopropyl alcohol and its metabolite, acetone, act as central nervous system (CNS) depressants. Symptoms of isopropyl alcohol poisoning include flushing, headache, dizziness, CNS depression, nausea, vomiting, anesthesia, and coma. Poisoning can occur from ingestion, inhalation, or absorption; therefore, well-ventilated areas and protective gloves are recommended. Around 15 g of isopropyl alcohol can have a toxic effect on a 70 kg human if left untreated.
Also worth reading- http://en.wikipedia.org/wiki/Environmental_impact_of_hydraulic_fracturing
Hydraulic fracturing can concentrate levels of uranium, radium, radon, and thorium in flowback (waste water)
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