| |

Arsenic in the News

Byoliveridley

Professor wins $1M for arsenic filter – Yahoo! News

The National Academy of Engineering announced Thursday that the 2007 Grainger Challenge Prize for Sustainability would go to Abul Hussam, a chemistry professor at George Mason University in Fairfax. Hussam’s invention is already in use today, preventing serious health problems in residents of the professor’s native Bangladesh.

This British Geological Survey website provides a good primer to the problem. Some key points:

  1. Arsenic is very toxic
  2. Arsenic is naturally occurring in the shallow groundwater aquifers of Bengal and Bangladesh at a toxic level
  3. The surface water is contaminated with bacteria and was responsible for high infant mortality, so aid agencies in the ’70s encouraged the use of tube wells and other groundwater pumps. While this contributed to a decline in infant mortality from gastrointestinal infections, it also dosed unsuspecting people with disease causing levels of arsenic
  4. The technology for removal of arsenic is very well known. But most solutions require electricity/periodic maintenance/technical skills and are thus not universal or sustainable.
  5. Simplicity is the key. You can’t tell the people to not drink the water, it is the only clean water available. You can’t install water treatment plants, there is no running water, you can’t rely on solutions that are centralized.

So with all that in mind, here’s what Prof. Hussam did:

The Gold Award-winning SONO filter is a point-of-use method for removing arsenic from drinking water.  A top bucket is filled with locally available coarse river sand and a composite iron matrix (CIM).  The sand filters coarse particles and imparts mechanical stability, while the CIM removes inorganic arsenic.  The water then flows into a second bucket where it again filters through coarse river sand, then wood charcoal to remove organics, and finally through fine river sand and wet brick chips to remove fine particles and stabilize water flow.  The SONO filter is now manufactured and used in Bangladesh. That’s great, and easy!

That’s pretty much freshman chemistry right there, further proof that most innovation does not need new science, only people willing to spend some time on problems that don’t necessarily get looked at.

Similar Posts

  • Benzene in soft drinks – Flavor of the Month?

    Byoliveridley

    Benzene Levels in Soft Drinks Above Limit – Yahoo! News

    WASHINGTON – Cancer-causing benzene has been found in soft drinks at levels above the limit considered safe for drinking water, the Food and Drug Administration acknowledged Wednesday.
    Even so, the FDA still believes there are no safety concerns about benzene in soft drinks, or sodas, said Laura Tarantino, the agency’s director of food additive safety.”We haven’t changed our view that right now, there is not a safety concern, not a public health concern,” she said. “But what we need to do is understand how benzene forms and to ensure the industry is doing everything to avoid those circumstances.”

    The admission contradicted statements last week, when officials said FDA found insignificant levels of benzene.

    In fact, a different study found benzene at four times the tap water limit, on average, in 19 of 24 samples of diet soda.

    The formation of benzene in soft drinks is from the reaction of ascorbic acid (aka Vitamin C) and benzoate salts, notably sodium benzoate which is used as a preservative. As the FDA letter states:

    We learned that elevated temperature and light can stimulate benzene formation in the presence of benzoate salts and vitamin C, while sugar and EDTA salts inhibit benzene formation.

    Is this a pressing concern? First of all, exposure modeling done by the EPA indicates that 93% of all benzene exposure is through inhalation (cigarette smoke, indoor offgassing, that wonderful refueling smell!), with 7% exposure through oral ingestion. So, potentially elevated levels in this 7% fraction are not likely to greatly increase exposure. In addition, the 5 parts per billion level for drinking water is set based on an assumed daily consumption of 2 liters per day (Source – USEPA), a safety factor up from the actual estimated 0.9-1.2 L per day measured consumption. Assuming the average amount of benzene in soda (mainly diet, mind you) is 4 times that of drinking water, a 500 ml dose of diet soda per day is required to equal the dose from drinking water, which mind you, only counts for 7% of the total bezene exposure. So in a sense, a person drinking 2 servings of diet soda per day would exceed the exposure from drinking water at the federally regulated level, and knock the socks off the California standard of 0.13 ppb in water. This will increase his/her known oral exposure. The total exposure to benzene of that individual, however, would not go up significantly because the overwhelming majority of the exposure still occurs through the nose, not through the mouth.

    The issue here, and benzene is just the symptom, is that consumers know much more about their drinking water than they do about their manufactured food products, and that is not good for the consumer or for the industry because in the absence of knowledge and full disclosure, both parties are vulnerable. Which is why attempts to limit consumer knowledge hurt everyone.

    Conclusion Please don’t stop drinking soda because of this, I am sure you can find plenty of other reasons to limit your soda consumption… Drink lots of filtered tap water, it’s the best!! And, I can assure you that most tap water is tested thoroughly, it’s zero calories and cheap!

  • |

    Grad student measures hazardous levels of air pollution at cigar show

    Byoliveridley

    Sure makes my graduate work in air quality seem a little tame!

    The man behind the subterfuge (Researcher 2, male) was Ryan David Kennedy, 34, a scrappy Canadian graduate student with crooked glasses who is studying the impact of tobacco on air quality.He crossed the border at Buffalo on Monday morning and on Tuesday crashed the giant cigar party and trade show sponsored by the publisher of Cigar Aficionado magazine at the Marriott Marquis in Times Square.

    At a Cigar Show, an Air-Quality Scientist Under Deep, Smoky Cover – New York Times

    Well, what did he find? Particulate matter readings four times higher than “hazardous”. Sometimes I think of strapping on a sampler and going to the local bar just out of curiosity. I can leave the bar if it gets smoky, the bartenders and wait staff can’t. I don’t see why this is not a clear case of hazardous working conditions leading to an immediate indoor smoking ban.  but what do I know, I’m just a scientist!

    Happy Thanksgiving.

    Blogged with Flock

  • |

    Genes Make Indians Fat

    Byoliveridley

    Scientists have pinpointed a reason why people with Indian ancestry may be more prone to weight problems.They have found this group is more likely to carry a gene sequence linked to an expanding waist line, weight gain and type 2 diabetes.The sequence, discovered by a team led by Imperial College London, is carried by 50% of the population – but is a third more common in Indian Asians.

    BBC NEWS | Health | Genes ‘up Indians’ obesity risk’

    Relax, all desis, it’s not your fault, it’s genetics.

    Blogged with the Flock Browser
  • |

    The most important thing I read today (Indian Agriculture Edition)

    Byoliveridley

    Yes, I read the Times article about this subject too, but Tom Philpott and P. Sainath writer better and more eloquently.

    India, food, and modernization | Gristmill: The environmental news blog | Grist

    That “promising biotechnology” is Monsanto’s Bt cotton seed, genetically modified to ward off the cotton bollworm. Indian farmers have been desperate to get their hands on it because they think they need it to compete with their lavishly capitalized and subsidized U.S. peers.

    But the Monsanto seed, which promises to enable farmers to use 25 percent less pesticide, might not be worth the premium (it goes for about twice as much as conventional seed, the Times reports). The great Indian journalist P. Sainath wrote recently that “despite all the claims made for [Bt cotton], input dealers here have seen no decline in pesticide sales as a result of its use. Some claim higher sales than before.”

    As prices for seeds and other inputs rise, farmers have seen the price their goods fetch in the marketplace fall or stagnate. The result has been crushing debt burdens, mounting losses, and a stunning surge in suicides among farmers.

    The Times reports that “17,107 farmers committed suicide in 2003, the most recent year for which government figures are available. Anecdotal reports suggest that the high rates are continuing.”

    Well, that’s one way to clear the land of “inefficient” farmers.

    For the enduring scam that is BT cotton, read this.

  • |

    Stalking my walking.

    Byoliveridley

    image

    Google Now tells me I have walked 74 km in February (one of the last meaningful acts of my phone before it passed away). That’s mostly me walking from my bus stop to work and back, 3.6 km everyday, something I don’t consider exercise to the point that I undergo serious bouts of self-criticism about “not exercising enough”. I post this because I, like many around me, am very concerned about the amount of digital surveillance in our society. Everyday, Snowden’s document dump brings new revelations. Yahoo webcam images, anyone? But the benefits of benign surveillance are potentially big. I would like my phone to remind me that I am exercising, that my bus is scheduled to arrive in 5 minutes (of course, BC Transit does not have real-time information, so this is theoretical), that I am near a grocery store that has my favourite cereal on sale (this would need open data on retail prices), that my neighbour on the bus is reading the same book that I am (okay, too much!).

    Cellphones are now intelligent, location and context aware. They can do a lot of good. Hell, I’ll even tolerate the use of some of my metadata for advertising and information gathering as long as it is transparent. But the data is also used by governments non-transparently to track my movements and actions, and I am deeply uncomfortable with it. Till now, my gee-whizness and fairly high belief in the value of a trust-based open information commons keeps me from closing off these data streams. If we stop trusting in the good of an open internet and stop contributing, the internet is seriously harmed.

  • |

    Opinion Polls and Yes Prime Minister

    Byoliveridley

    This story from the grist about a push poll arranged by Rasmussen showing 67% support for the reinstatement of offshore oil drilling in the United States reminded me of this most delightful exchange from Yes Prime Minister, still one of my all time favourite television shows and one that taught me almost everything I needed to know about parliamentary politics at a tender age. The show is about British politics through the eyes of an earnest but bumbling politician, his very experienced bureaucratic handler and his secretary with divided loyalties. The show is incredibly insightful and funny at the same time. But, before I get to my favourite part, some background…

    It’s that time of the year when the republicans want to enrich their oil buddies by opening up oil drilling offshore of the U.S. This year, the high price of gas provides a convenient excuse and rallying point. After all, who wouldn’t want to pay less for gas. Of course, a U.S government study done by the Energy Information Administration in 2007 indicates that at best, you would see a 3% increase in production by 2030, and we all know how much that would affect gasoline prices this summer. Yet, here’s the first question from the “poll”

    In order to reduce the price of gas, should drilling be allowed in offshore oil wells off the coasts of California, Florida, and other states

    No really, what are you supposed to say? Can such reputable firms lie to you like that? Anyway, Joseph Romm from the original gristmill post breaks it down completely so I don’t have to. but after reading his post, come back and read the following exchange from Yes Prime Minister, and do listen to the actual audio clip from the show.

    Yes Prime Minister – Season 1Episode 2 (warning: Strangely formatted website)

    Sir Humphrey: “You know what happens: nice young lady comes up to you. Obviously you want to create a good impression, you don’t want to look a fool, do you? So she starts asking you some questions: Mr. Woolley, are you worried about the number of young people without jobs?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Are you worried about the rise in crime among teenagers?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Do you think there is a lack of discipline in our Comprehensive schools?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Do you think young people welcome some authority and leadership in their lives?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Do you think they respond to a challenge?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Would you be in favour of reintroducing National Service?”

    Bernard Woolley: “Oh…well, I suppose I might be.”

    Sir Humphrey: “Yes or no?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Of course you would, Bernard. After all you told you can’t say no to that. So they don’t mention the first five questions and they publish the last one.”

    Bernard Woolley: “Is that really what they do?”

    Sir Humphrey: “Well, not the reputable ones no, but there aren’t many of those. So alternatively the young lady can get the opposite result.”

    Bernard Woolley: “How?”

    Sir Humphrey: “Mr. Woolley, are you worried about the danger of war?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Are you worried about the growth of armaments?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Do you think there is a danger in giving young people guns and teaching them how to kill?”

    Bernard Woolley: “Yes”Sir Humphrey: “Do you think it is wrong to force people to take up arms against their will?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “Would you oppose the reintroduction of National Service?”

    Bernard Woolley: “Yes”

    Sir Humphrey: “There you are, you see Bernard. The perfect balanced sample.”

    That is what I think about opinion polls!