Presentation is loading. Please wait.

Presentation is loading. Please wait. ©2014 Ben Keet 1 Development of the ‘Ben Keet Method’ of house dust analysis to identify lead and other contaminants Drs. Ben Keet, SQEP,

Similar presentations

Presentation on theme: " ©2014 Ben Keet 1 Development of the ‘Ben Keet Method’ of house dust analysis to identify lead and other contaminants Drs. Ben Keet, SQEP,"— Presentation transcript:

1 ©2014 Ben Keet 1 Development of the ‘Ben Keet Method’ of house dust analysis to identify lead and other contaminants Drs. Ben Keet, SQEP, FRSC, MRSNZ, MinstD Geo & Hydro – K8 Ltd e-mail:

2 After years of cleaning up industrial sites …. I realised need to focus on the important issues Like the environmental effects on people, esp. Children This requires a change from commercial environmental engineering to social environmental engineering©2011 Ben Keet 2

3 However CHANGE, - happens even when you don’t expect it - but not always the way you want - or as fast©2011 Ben Keet 3

4©2011 Ben Keet 4 Estimated costs of paediatric lead poisoning, United States, 1997. Environment Attributable Factor (EAF)= 100% Main consequence = Loss of IQ over lifetime Mean blood lead level in 1997 among 5-year-old children= 2.7 µg/dL A blood lead level of 1 µg/dL I points per child= Mean loss of 0.25 Therefore, 2.7 µg/dL = Mean loss of 0.675 IQ points per child Loss of 1 IQ point = Loss of lifetime earnings of 2.39% Therefore, loss of 0.675 IQ points = Loss of 1.61% of lifetime earnings Economic consequences For boys: loss of 1.61%× $881,027 (lifetime earnings) × 1,960,200 = $27.8 billion For girls: loss of 1.61% × $519,631 (lifetime earnings) × 1,869,800 = $15.6 billion Total costs of paediatric lead poisoning = $43.4 billion Environmental Pollutants and Disease in American Children: Estimates of Morbidity, Mortality, and Costs for Lead Poisoning, Asthma, Cancer, and Developmental Disabilities, Philip J. Landrigan, Clyde B. Schechter, Jeffrey M. Lipton, Marianne C. Fahsand Joel Schwartz, The Center for Children’s Health and the Environment, The Department of Community and Preventive Medicine, and The Department of Pediatrics, Mount Sinai School of Medicine, New York, New York, USA; Environmental Health Perspectives VOLUME 110 | NUMBER 7 | July 2002 For me it started with realizing the social costs of lead poisoning. Searching I only found financial implications : Whaw !

5©2014 Ben Keet 5 Environmental attributable cost by condition Base-case (US $ Billion) Lead poisoning50.9 Methyl Mercury tox5.1 Asthma2.2 Intellectual Disability5.4 Autism7.9 ADHD5 Ref. Leonardo Trasande and Yinghua Liu Reducing The Staggering Costs Of Environmental Disease In Children, Estimated At $76.6 Billion In 2008 (published online May 4, 2011; 10.1377/hlthaff.2010.1239), 30, no.5 (2011):863-870 Health Affairs Lead = 66% of total cost of $ 76.6 Billion just in USA 6 years and a few $m R&D later same outcomes

6 Hypothesis: In NZ the cost ‘per person’ is 2 x higher NZ$ 1.5 Billion (annually ! ) reasons: NZ houses: Many of wood and w/b – all walls painted v.s. US houses: Many of brick – only windows and doors painted Interiors NZ: - mainly painted v.s. US:- high use of wall paper NZ phased out last lead-based paint around 1982 v.s. US phased out lead-based paint around 1965 NZ average disposable income is much lower than in the US leading to poor maintenance and less re-painting.©2008 Ben Keet 6

7 Lead-based paint history©2011 Ben Keet 7 Pre-1945 - 70 paint > 50% Pb Start phase out world-wide in late ‘60-ies Still in use in NZ in mid ‘80-ies

8 1980 - 1.000.000 households in NZ 1984 BRANZ estimates: 251.000 properties with lead based paint©2011 Ben Keet 8 Ref. NZ Statistics

9 Difference US - NZ NZ US (RRP = Renovation Repair Painters) On January 1, 2011, firms working in pre-1978 homes and child- occupied facilities must be certified and use lead-safe work practices during renovations. The penalty for noncompliance is $37,000 per day, per violation and possible jail time©2014 Ben Keet 9 Dominion Post 27 July 2011 Are we taking Lead serious in NZ?

10 How my journey began 2006 (I just got a handheld XRF analyser) Parent from school requests assessment of house and garden as his 2 yr old became sick a few weeks after moving in a new (old) house (‘30-ies) Lead level in garden around house was > 2000 mg/kg Swipe test of floors gave > 20 mg/m 2 of lead (US clearance = 100 μg/ft 2 ) [20 x over] Swipes: cumbersome, variable and costly. very dependent on time since cleaning (info from mother re last cleaning = invariably wrong)©2014 Ben Keet 10

11 Late 2006 More house surveys Used battery vacuum cleaner to take dust samples Main flaw: Areas most frequented and also most often cleaned Surveys biased towards least used and least cleaned areas.©2014 Ben Keet 11

12 2007 Used vacuum cleaner bag to get average dust sample Useful as the most used areas are also most often vacuumed Started to separate the dust into grain size fractions©2011 Ben Keet 12 Very first sieved house dust analysis

13 If on site: analyse painted surfaces & soil©2011 Ben Keet 13 And mark with lead concentration Soil

14 2008: FREE survey at HB Field Days©2014 Ben Keet 14 Stand in HBRC marquee Opposite entrance gate 6000 visitors – 3 days 14 people signed up 4 gave permission to publish results

15 Main stumbling blocks Home owners don’t want “bad info” on their property (value worries) Many prefer not to know (ostriches) “If it was an issue, the council would inform us” Solution: Vacuum cleaner bags dropped off at intermediary (Environment Centres) Or send direct to independent lab: Now the ‘Ben Keet Method’ is offered by Hill Laboratories©2014 Ben Keet 15

16 Some results©2011 Ben Keet 16 Every analysis tells a story There are similarities ……

17 Initial findings: Analysis of fine and coarse fractions gives total concentration AND an indication where the problem may be: Coarse particles containing lead originate mainly from indoors Fine particles containing lead may be carried in house from outdoors My hypotheses: 1 Better correlation blood lead level - lead in fine dust (i.e. soil is important) 2 Lead concentration in particle seize indicates source 3 Mass identification of houses with high lead is possible using a Aerial photographs b Visual indicators Possible other factors; lead speciation, bio-availability©2014 Ben Keet 17

18 Conclusion:‘Ben Keet Method’ of house dust analysis is Potentially Better Significantly Cheaper Using dust from vacuum cleaner bag provides: House average lead concentration in dust for most used areas Rapid assessment of potential lead exposure Significant savings compared to wipe tests Can be carried out off-site – even anonymous©2008 Ben Keet 18 Recommended remediation of lead-paint surfaces: Clean surfaces with ammonia / sugar soap solution Re-paint with acrylic based paint Recommended for garden soil high in lead: Ensure good mats at house entrance Replace soil or cover with new soil + indicator layer

19 Further work, recommendations and R&D needed©2011 Ben Keet 19  Study relationship lead in dust fractions with blood lead level (bll)  Lead dust surveys should be carried out in all pre 1980 houses with small children  Lead dust house surveys should be recommended by Plunket for all pregnant woman  Testing for lead in blood of pregnant woman and babies should become standard in NZ ( as in is in the US and many EU countries )  MfE, DHB’s, councils should subsidise remedial work (re-painting / soil work) of older houses, especially for households with young kids (just like house insulation)

20 Housing Authority of Baltimore City is to pay nearly $12 million in court-ordered judgments that it owes former public housing tenants who suffered lead-paint poisoning years ago as children. By Scott Calvert, The Baltimore Sun8:59 a.m. EDT, August 18, 2011,0,7720622.story?goback=%2Egde_164261_member_68234249©2014 Ben Keet 20 Thank you for your attention Questions – discussion…………………….. Reminder:

Download ppt " ©2014 Ben Keet 1 Development of the ‘Ben Keet Method’ of house dust analysis to identify lead and other contaminants Drs. Ben Keet, SQEP,"

Similar presentations

Ads by Google