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7 July 2009
Arsenic poisoning victims in Chile in 5000 BCE

Seven thousand years ago, about 100 km from the contemporary port city of Arica in Chile, a child died. The grieving parents did not want to part with the last remains. They removed the head and internal organs of the child, stuffed it with animal hide, painted a clay model of his head and decorated it with tufts of his hair. The delicately preserved body was excavated in 1983. Archaeologists believe it is the earliest mummy. More than 100 child mummies were discovered in Camarones near Arica that year. Later, preserved bodies of adults were found as well. Archaeologists say the embalmed bodies were of people from Chile's Chinchorro community.
     Unlike mummies in later civilizations that spun around prestige, wealth and power, Chinchorro mummification was based on a democratic and humanistic view of the dead, and everyone was mummified. Archaeologist Bernardo Arriaza, who studies the Chinchorro at the University of Tarapaca in Arica, wrote that unlike the Egyptians who hid the dead, the Chilean community embraced them. The child mummies even took their place besides their parents at the dinner table.
     A few years ago Arriaza launched a daring new theory: the Chinchorro were victims of arsenic poisoning. "I was reading a Chilean newspaper that said arsenic caused abortions. I jumped in my seat and said, That's it," Arriaza said. Following the lead, Arriaza collected 46 hair samples from Chinchorro excavated from 10 sites in northern Chile. Ten samples from the Camarones river valley had an average of 37.8 microgrammes per gramme - much higher than one to 10 microgramme of arsenic per gramme that indicates chronic toxicity according to World Health Organization standards. The sample from an infant's mummy had a residue of 219 microgramme per gramme.
     One theory is that they could have washed their hair with arsenic contaminated water but pathologists explain that washing is unlikely to leave such high levels of arsenic traces. Arriaza has another explanation. Chinchorros were a fishing society; in the 1960s tests on water drawn by the city of Antofagasta in the Camarones river valley showed that it was laced with 860 microgrammes of arsenic per litre-86 times higher than the limits acceptable by who. Arriaza believes this was so even 7,000 years ago. Tests on the Chinchorro mummies strengthen the arsenic poisoning theory.
     "In highly stratified societies like ours, lower-class children receive simple or meager mortuary disposal. But in a small group, the death of children certainly threatened the survival of the entire group. Affection and grief may thus have triggered the preservation of children," the archaeologist said.

Source: Down to Earth (July 2009)

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