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Eliminating arsenic from drinking water
Chemistry World ^ | 28 January 2011 | Emma Shiells

Posted on 02/03/2011 5:34:32 PM PST by neverdem

An iron-rich, porous material can remove arsenic from drinking water in under two hours, say Chinese scientists. 

Arsenic is notoriously toxic, proving fatal to the majority of living organisms in high doses. Elevated levels of arsenic in groundwater in countries such as Bangladesh pose a serious threat to human health. But traditional methods to remove the arsenic struggle to eliminate the more dominant arsenic ion, arsenite. 

Now, Kang Li and colleagues from Harbin Medical University have removed arsenite from water samples using ferrihydrite - a low cost, natural mineral found on the Earth's surface. Already known to absorb arsenic, its efficiency is usually hindered by its low surface area. The team overcame this by combining two layers of ferrihydrite, increasing its surface area and loading capacity. Arsenite was selectively removed from water, even in the presence of other anions with similar molecular structures. Removal of the arsenite from the surface of the ferrihydrite material was easily achieved by washing it with an alkali solultion. After a heat treatment, the mesoporous material could be reused up to ten times.

Eliminating arsenic from drinking water

Elevated levels of arsenic in drinking water pose a serious threat to human health

© UNITED NATIONS

Li believes that the recycling aspect holds the greatest challenge for future practical applications for the material. 'If magnetic nanoparticles could be loaded in the channels of the two-line ferrihydrite, recycling would become even easier,' he says. 

'The next step should be related to the investigation of the mechanism and efficiency of arsenic removal by nanocrystalline iron oxides depending on their structure and crystallinity,' says Radek Zboril, an expert in nanocrystalline iron oxides from Palacky University in the Czech Republic. 

'The incorporation of arsenic into the structure of the in situ formed iron oxide nanoparticles seems to be a more promising way from the viewpoint of real applications.' 

 

 

Link to journal article

One-step synthesis of mesoporous two-line ferrihydrite for effective elimination of arsenic contaminants from natural water
Zhenzi Li, Tao Zhang and Kang Li, Dalton Trans., 2011
DOI: 10.1039/c0dt01138j

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TOPICS: Culture/Society; News/Current Events; Technical
KEYWORDS: arsenic; chemistry; health

1 posted on 02/03/2011 5:34:34 PM PST by neverdem
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To: neverdem
I thought we fought this the first month Bush was in office. Oh, that was when Bush wanted to poison our drinking water.
2 posted on 02/03/2011 5:38:42 PM PST by Bronzy (We Remembered In November.)
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To: neverdem
An iron-rich, porous material can remove arsenic from drinking water in under two hours, say Chinese scientists.

Chinese also say, "We prut mateereeul wif ars-nic into pills. Sell as aneeemeeuh medcine in U.S. of A."

3 posted on 02/03/2011 5:39:13 PM PST by MIchaelTArchangel (Obama makes me miss Jimmah Cahtah!)
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To: neverdem
Its a problem in Idaho. See Idaho Arsenic (PDF)
4 posted on 02/03/2011 5:53:41 PM PST by Myrddin
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To: neverdem
Arsenic is notoriously toxic, proving fatal to the majority of living organisms in high doses. Elevated levels of arsenic in groundwater in countries such as Bangladesh pose a serious threat to human health. But traditional methods to remove the arsenic struggle to eliminate the more dominant arsenic ion, arsenite.

Contrary to popular opinion, arsenic is an element, a natural material found in the soil almost everywhere -- to varying degrees. Check your periodic table for details.

"Industrial pollution" has nothing to do with it.

The Clinton administration arbitrarily reduced the standard for arsenic in water supplies from like 8 to 4 parts per billion. Despite there being any evidence that any American had suffered any damage whatsoever -- much less death -- from arsenic in the water supply.

As a consequence, several small towns in North Dakota and South Dakota had to completely re-work their water treatment plants -- at the cost of millions of dollars. Again, without any individual in those towns having ever suffered any ill effects attributable to arsenic.

While this finding could have a huge impact on public health in places like Bangladesh, its application is completely unneccessary in the USA -- unless some town in the Dakotas is in the market for a replacement water treatment plant.

The enviro-whackos will, of course, have a different opinion...

5 posted on 02/03/2011 5:54:58 PM PST by okie01 (THE MAINSTREAM MEDIA: Ignorance On Parade)
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To: neverdem

I think UI remember seeing something in Houston about this.


6 posted on 02/03/2011 5:59:08 PM PST by freekitty (Give me back my conservative vote; then find me a real conservative to vote for)
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To: neverdem

Broken red brick fragments work fine, as does running the water through a drum of rusty nails.

India has used this method for years.


7 posted on 02/03/2011 5:59:23 PM PST by BwanaNdege ("a comeuppance is due the arrogant elites" - Charles Krauthammer)
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To: okie01

I know someone who’s naturapath solved her carpal tunnel syndrome problem.....by ADDING arsenic to her diet....because they said there was no longer enough in the water!


8 posted on 02/03/2011 6:00:09 PM PST by goodnesswins (Socialism is organized stupidity. 2nd thought...I think DEMOCRATS are Organized Stupidity.)
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To: Bronzy

“I thought we fought this the first month Bush was in office.”

That was when Bush showed just how INCOMPETENT he was. He should have simply issued an executive order invalidating ANY regulation that was written after election day - but no, all we got was the Republicans getting trashed and one-way talk about a new tone.

Perhaps a court would have invalidated the order, who knows, but there are times YOU MUST FIGHT.


9 posted on 02/03/2011 6:09:08 PM PST by BobL (PLEASE READ: http://www.freerepublic.com/focus/f-news/2657811/posts)
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To: BobL

Oh, how we wish the Republicans would fight like the rats.


10 posted on 02/03/2011 6:16:39 PM PST by Bronzy (We Remembered In November.)
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To: goodnesswins

Also used in chemotherapy. It’s all a matter of degree and good for those scientists for their discovery.


11 posted on 02/03/2011 6:17:06 PM PST by NonValueAdded (Palin 2012: don't retreat, just restock [chg'd to comply w/ The Civility in Discourse Act of 2011])
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To: goodnesswins
because they said there was no longer enough in the water!

I can believe it. Because there is trace amount of arsenic in just about everybody's water -- a few parts per billion.

Arsenic is like every other toxic material -- it's the dose, not the material itself. And, at a certain level, the body is known to need many toxic materials -- like chlorine, fluorine, etc.

12 posted on 02/03/2011 6:18:42 PM PST by okie01 (THE MAINSTREAM MEDIA: Ignorance On Parade)
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To: neverdem
What kind of dumbsh!t wrote this article without mentioning that small trace amounts of arsenic are required by the human metabolism?

Did they think only Oprah watchers were going to read this?

13 posted on 02/03/2011 6:21:00 PM PST by MrEdd (Heck? Geewhiz Cripes, thats the place where people who don't believe in Gosh think they aint going.8)
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To: neverdem
What kind of dumbsh!t wrote this article without mentioning that small trace amounts of arsenic are required by the human metabolism?

Did they think only Oprah watchers were going to read this?

14 posted on 02/03/2011 6:22:05 PM PST by MrEdd (Heck? Geewhiz Cripes, thats the place where people who don't believe in Gosh think they aint going.8)
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To: Myrddin

Thanks for the link.


15 posted on 02/03/2011 6:47:14 PM PST by neverdem (Xin loi minh oi)
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To: MrEdd
What kind of dumbsh!t wrote this article without mentioning that small trace amounts of arsenic are required by the human metabolism?

I have a 10 year old source, Harrison's Principles of Internal Medicine, which mentioned there's "circumstantial evidence" in passing. Do you have convincing evidence that's more recent?

16 posted on 02/03/2011 7:06:37 PM PST by neverdem (Xin loi minh oi)
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To: El Gato; Ernest_at_the_Beach; Robert A. Cook, PE; lepton; LadyDoc; jb6; tiamat; PGalt; Dianna; ...
Flaw in induced-stem-cell model - Adult cells do not fully convert to embryonic-like state. This looks bad, IMHO.

Some stem cells hold on to their past, researchers say You'll get the printed abstract first.

The Spray on Skin Gun Heals Burns Within Hours or Days

Bacteria in mouse gut affect development and behaviour The BBC linked the abstract.

FReepmail me if you want on or off my health and science ping list.

17 posted on 02/03/2011 7:29:41 PM PST by neverdem (Xin loi minh oi)
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To: okie01

The problem is that zero keeps shifting. These idiots never heard of hormesis. Yet, they delight in lowering limits only to look good or keep their bureaucrats busy.

HUD did the same thing with lead levels in children. The numbers had dropped so quickly that they arbitrarily lowered the acceptable amount by half. Suddenly, there was an uptick in children with lead “poisoning”.


18 posted on 02/04/2011 2:48:40 AM PST by 1010RD (First, Do No Harm)
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To: goodnesswins

“I know someone who’s naturapath solved her carpal tunnel syndrome problem.....by ADDING arsenic to her diet....because they said there was no longer enough in the water!”

I read a study a few months back that used Arsenic to treat cancer.

The reduction of Arsenic in drinking water to ridiculous levels may fit the law of unintended consequences. Another example-Congress mandated folate to be included in foods to help pregnant women, but folate is a big no-no when it comes to active cancers. It helps it along.


19 posted on 02/04/2011 3:44:04 AM PST by KeyWest (Help stamp out taglines! They are obamanations.)
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To: 1010RD
These idiots never heard of hormesis.

Neither had I. Looked it up and learned something, thank you. And it sure is applicable to the matter at hand.

20 posted on 02/04/2011 9:36:04 AM PST by okie01 (THE MAINSTREAM MEDIA: Ignorance On Parade)
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To: okie01

You do a great job commenting thoughtfully and often with great insight, so I appreciate the compliment.

I learned about hormesis from Art Robinson who was a student researcher with Linus Pauling. It was a long time ago, but they had a falling out over vitamin C (Robinson said the results disproved Pauling’s contention that C was a cure-all and often worsened some diseases).

Pauling’s other sin, like a lot of liberal gurus they have so many and never apologize, was that radiation or any insult to the body was always bad (linearly, i.e. the more the worse). This lead to our modern Greens, Communists, and EPA calling for “zero” levels of any toxin.

Clearly, this is unscientific as dose makes every poison and oxygen and water are toxic at the proper level. But, Robinson went further proving that hormesis exists and as regards radiation too little radiation causes cancer.

Robinson contends that Australian life guards have the lowest incident of skin cancer, but the highest of sun exposure. Look him up it is interesting stuff.

I might be confusing stories, but he worked in a lab where Pauling was working on showing how dangerous DDT was. They fed lab rats DDT and the control group a “healthy” diet, including Linus’ darling vitamin C. The DDT rats thrived, grew larger than normal and were trim and muscular while the rats on the “healthy” diet didn’t.

Pauling pulled the plug when his RAs started calling DDT, Vitamin DDT. He was a jerk and a liar.

You’d like Art Robinson. Search around for him. He and his children are a remarkable bunch - Christians, Scientists and great thinkers - naturally they’re conservatives. ;-]

Spread the word. There’s nothing like the truth, eh?


21 posted on 02/04/2011 9:58:17 AM PST by 1010RD (First, Do No Harm)
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