Thallium poisoning

Thallium poisoning
Classification and external resources
Thallium
ICD-10	T60.4
ICD-9	985.8
DiseasesDB	13009

Thallium and its compounds are often highly toxic.^[1] Contact with skin is dangerous, and adequate ventilation should be provided when melting this metal.^[2] Many thallium(I) compounds are highly soluble in water and are readily absorbed through the skin. Exposure to them should not exceed 0.1 mg per m² of skin in an 8-hour time-weighted average (40-hour work week). Thallium is a suspected human carcinogen.^[2]

Part of the reason for thallium's high toxicity is that, when present in aqueous solution as the univalent thallium(I) ion (Tl⁺), it exhibits some similarities with essential alkali metal cations, particularly potassium (due to similar atomic radii). It can thus enter the body via potassium uptake pathways.^[3] Other aspects of thallium's chemistry differ strongly from that of the alkali metals, such its high affinity for sulfur ligands. Thus this substitution disrupts many cellular processes (for instance, thallium may attack sulfur-containing proteins such as cysteine residues and ferredoxins).^[4] Thallium's toxicity has led to its use (now discontinued in many countries) as a rat and ant poison.^[1]

Among the distinctive effects of thallium poisoning are loss of hair (which led to its initial use as a depilatory before its toxicity was properly appreciated) and damage to peripheral nerves (victims may experience a sensation of walking on hot coals), although the loss of hair only generally occurs in low doses; in high doses the thallium kills before this can take effect.^[5] Thallium was once an effective murder weapon before its effects became understood, and an antidote (Prussian blue) discovered.^[6] Indeed, thallium poisoning has been called the "poisoner's poison" since thallium is colorless, odorless and tasteless; its slow-acting, painful and wide-ranging symptoms are often suggestive of a host of other illnesses and conditions.^[7]

Treatment and internal decontamination

Two of the main methods of removing thallium (both radioactive and stable isotopes) from humans is to use Prussian blue, which is a solid ion exchange material, which absorbs thallium. Up to 20 g per day of Prussian blue is fed by mouth to the person, and it passes through their digestive system and comes out in the stool. Hemodialysis and hemoperfusion are also used to remove thallium from the blood serum. At later stage of the treatment additional potassium is used to mobilize thallium from the tissue.^[8][9]

Bioconcentration

According to the United States Environmental Protection Agency (EPA), thallium release to the environment was reported in Texas and Ohio. This may indicate bioconcentration in aquatic ecosystems.[1]

Thallium compounds

The odorless and tasteless thallium sulfate was also used as rat poison and ant killer. Since 1975, this use in the United States and many other countries is prohibited due to safety concerns.^[10]

Detection in body fluids

Thallium may be quantitated in blood or urine as a diagnostic tool in clinical poisoning situations or to aid in the medicolegal investigation of suspicious deaths. Normal background blood and urine concentrations in healthy persons are usually less than 1 μg/litre, but they are often in the 1–10 mg/litre range in survivors of acute intoxication.^[11][12]

Famous uses as a poison

There are numerous recorded cases of fatal thallium poisoning.^[13] Because of its use for murder, thallium has gained the nicknames "The Poisoner's Poison" and "Inheritance Powder" (alongside arsenic).

Australia's "Thallium Craze"

In Australia in the early 1950s there was a notable spate of cases of murder or attempted murder by thallium poisoning. At this time, due to the chronic rat infestation problems in overcrowded inner-city suburbs (notably in Sydney), and thallium's effectiveness as a rat poison, it was still readily available over the counter in New South Wales, where thallium sulphate was marketed as a commercial rat bait, under the brand "Thall-rat".

• In September 1952 Juanita Nielsen.
• A month later, in October 1952, Bathurst grandmother Ruby Norton was tried for the murder of her daughter's fiance Allen Williams, who died of thallium poisoning at Cowra Hospital in July 1952. Despite allegations that Norton hated all the men in her family and Williams was an unwanted son-in-law, Norton was acquitted.^[16]
• Also in 1952, Sydney woman Veronica Monty, 45, was tried for the attempted murder of her son-in-law, noted Balmain and Australian rugby league player Bob Lulham, who was treated for thallium poisoning in 1952. After separating from her husband, Monty had moved in with her daughter Judy and Judy's husband, Bob Lulham. The sensational trial revealed that Lulham and Monty had an "intimate relationship" while Lulham's wife was at Sunday mass. Monty was found not guilty; Judy Lulham divorced her husband as a result of the revelations about his affair, and Veronica Monty killed herself with thallium in 1955.^[17]
• In July 1953 Sydney woman Beryl Hague was tried for "maliciously administering thallium and endangering her husband's life". Hague confessed to buying Thall-rat from a corner shop and putting it in her husband's tea, because she wanted to "give him a headache to repay the many headaches he had given me" in violent disputes^[18]
• In 1953, Australian Caroline Grills was sentenced to life in prison after three family members and a close family friend died. Authorities found thallium in tea that she had given to two additional family members. Grills spent the rest of her life in Sydney's Long Bay Gaol, where fellow inmates dubbed her "Aunt Thally".^[19][20][21]

The Australian TV documentary Recipe for Murder, released in 2011, examined three of the most sensational and widely reported Australian thallium poisonings, the Fletcher, Monty and Grills cases.

Other notable cases

• In 1957, Nikolai Khokhlov, a former KGB assassin, was poisoned with thallium.^[22] Khokhlov fell ill with stomach cramps and nausea; within days, his hair had fallen out and he was covered with marks on his skin. He fled the Soviet Union to Germany, where doctors suspected thallium poisoning and tried every known antidote without success. Khokhlov was then transferred to a hospital in the United States and treated with hydrocortisone, steroids, and blood and plasma transfusions. He eventually recovered.
• Félix-Roland Moumié, a Cameroonian leader, was assassinated in Geneva on 3 November 1960 by the SDECE (French secret service) with thallium.
• In 1971, thallium was the main poison that Graham Frederick Young used to poison around 70 people in the English village of Bovingdon, Hertfordshire, of whom 3 died.^[23]
• In 1977, a 19-month old girl living in Qatar fell ill due to thallium poisoning (from pesticides used by her parents). While doctors were unable to identify the cause, a nurse named Marsha Maitland managed to do it from the description of the symptoms given in The Pale Horse.^[24]
• In 1988, members of the Carr family from Alturas, Coca-Cola at the Carr and Trepal homes.^[25]
• Thallium was the poison of choice for Saddam Hussein to use on dissidents, which even allowed for them to emigrate before dying.^[26]
• Thallium poisoning case of Zhu Ling In 1995 Zhu Ling was the victim of an unsolved attempted thalium poisoning in Beijing, China. In 1994, Zhu Ling was a sophomore studying Physical Chemistry at Tsinghua University in Beijing. She began to show strange and debilitating symptoms at the end of 1994, when she reported experiencing acute stomach pain and extensive hair loss. Ultimately she was diagnosed on Usenet with poisoning by thallium. To this day, there is still speculation as to the poisoner's identity among Chinese expatriates overseas. The primary (and only) suspect of the police investigation, Sun Wei, is a member of a family with high-level political connections, which may have been used to halt and suppress the results of the investigation. Sun Wei was Zhu Ling's classmate and roommate in Tsinghua University from 1992 to 1997. Tsinghua University also said she was the only student who had access to thalium compound at the school. The investigation's results have never been released to Zhu Ling's parents or the general public. However, Tsinghua University declined to issue Sun Wei's B. S. certificate and refused to provide her with the documentation needed to get a passport or visa in 1997.
• In June 2004, 25 Russian soldiers earned Honorable Mentions in the Darwin Awards after becoming ill from thallium exposure when they found a can of mysterious white powder in a rubbish dump on their base at Khabarovsk in the Russian Far East. Oblivious to the danger of misusing an unidentified white powder from a military dump site, the conscripts added it to tobacco, and used it as a substitute for talcum powder on their feet.^[27]
• In 2005, a 17-year-old girl in Izunokuni, Shizuoka, Japan admitted to attempting to murder her mother by lacing her tea with thallium, causing a national scandal.^[28]
• In February 2007, two Americans, Marina and Yana Kovalevsky, a mother and daughter, visiting Russia were hospitalized for thallium poisoning. Both had emigrated from the Soviet Union to the United States in 1989 and had made several trips to Russia since then.^[29]
• In February 2008, members of an Iraqi air force club and some of their children were poisoned by cake laced with thallium.^[30] Two of the children died.
• In 2011, a chemist at Bristol-Myers Squibb in New Jersey, Li Tianle, was charged with the murder of her husband. According to an investigation by the Middlesex County Prosecutor's Office, Li Tianle was able to obtain a chemical containing thallium and feed it to her husband.^[31] Li was a chemistry student at Beijing University at the time of the highly publicized thallium poisoning of Zhu Ling in 1995 at neighboring Tsinghua University.^[32]
• In 2012 a chemistry postgraduate student at the University of Southampton, UK, was found to be suffering from the effects of thallium poisoning after presenting with neurological symptoms. Following an intensive course of treatment, the student is expected to make an eventual full recovery. The source of the poisoning remains unknown, though foul play is suspected.

In fiction

• Ngaio Marsh used thallium acetate in her 1947 detective novel, Final Curtain. It was being used legitimately for scalp problems in a group of school children just after World War Two, housed in a private estate. A relative living there used it in place of the heart medicine intended for the owner.
• Nigel Williams' 1990 novel The Wimbledon Poisoner, Henry Far uses thallium to baste a roast chicken in a failed attempt to murder his wife.
• Thallium figures prominently in the 1995 film The Young Poisoner's Handbook, a dark comedy loosely based on the life of Graham Frederick Young.
• In Big Nothing Josie is the Wyoming Widow; a murderer who befriended men and killed them with whiskey laced with highly concentrated thallium.
• "Page Turner", a 2008 episode of CSI: NY, has radioactive thallium poisoning as its central theme.^[34]

References

External links

• Toxicity, Thallium
• Slow-acting killer that was Saddam's favourite instrument of vengeance
• NLM Hazardous Substances Databank – Thallium, Elemental
• [3]
• Cyril Wecht, Thallium, Robert Curley
• ATSDR - ToxFAQs
• The Guardian reports: Two Iraqi children die from Thallium poisoning: 9 February 2008

See also