Amy Woodhouse wrote: wrote:Are the same people that would not dare use an aluminum pan ok with using an aluminum brick because it has a cob roof?
ABSTRACT To examine the associations between alumina and bauxite dust exposure and cancer incidence and circulatory and respiratory disease mortality among bauxite miners and alumina refinery workers.
This cohort of 5770 males has previously been linked to national mortality and national and state cancer incidence registries (1983-2002). In this paper, Poisson regression was used to undertake internal comparisons within the cohort based on subgroups of cumulative exposure to inhalable bauxite and alumina dust. Exposure was estimated using job histories and historical air monitoring data.
There was no association between ever bauxite exposure and any of the outcomes. There was a borderline significant association between ever alumina exposure and cerebrovascular disease mortality (10 deaths, RR 3.8, 95% CI 1.1 to 13). There was some evidence of an exposure-response relationship between cumulative bauxite exposure and non-malignant respiratory disease mortality (seven deaths, trend p value: 0.01) and between cumulative alumina exposure and cerebrovascular disease mortality (trend p value: 0.04). These associations were based on very few cases and for non-malignant respiratory disease the deaths represented a heterogeneous mixture of causes. There was no evidence of an excess risk for any cancer type with bauxite or alumina exposure.
These preliminary findings, based on very few cases, suggest that cumulative inhalable bauxite exposure may be associated with an excess risk of death from non-malignant respiratory disease and that cumulative inhalable alumina dust exposure may be associated with an excess risk of death from cerebrovascular disease. Neither exposure appears to increase the risk of incident cancers.
JC, people traditionally put food directly on the bricks in the oven right?
Sorry if you think discussing the effects of consuming a heavy metal irrational...
Amy Woodhouse wrote:Ah, my foundational understanding. From Wikipedia: "Beryllium and aluminium, although light metals, are sometimes counted as heavy metals in view of their toxicity"
Amy Woodhouse wrote:
Right Bill, What we are talking about is the aluminum dust that is inevitably scraped off the bricks during use and then ingested via food placed on said brick. This is not relevant for stoves or people that don't cook directly on their fire brick (which most people do).
Glenn Herbert wrote:Not getting into the toxicity or lack thereof, I have a few questions and comments about your math and chemistry. First, did the manufacturer say the 25% is by volume or by weight, and is that aluminum or aluminum oxide? Those factors would significantly affect the amount of aluminum in the bricks. I think the relevant factor is how big a volume weighs a milligram, thus how much powder would need to be scraped off with each pizza to be hazardous. If a milligram of firebrick powder (1/4 aluminum or 1/4 aluminum oxide, whichever it is) is a decent pinch, I think we can agree that nowhere near that much comes off with each pizza, let alone gets into the food or air that a person consumes. Hard firebrick are quite abrasion resistant, soft firebrick are not (and thus are not suitable in any way for an oven floor). I don't have equipment to measure a milligram of firebrick powder, but I could weigh out 0.1 gram and see how big a pile/pinch it is.
Victor Johanson wrote:Aluminum content of soil averages around seven percent...it's the most abundant element in the earth's crust. We grow our food in it and breathe the dust all the time. We probably shouldn't be ingesting aluminum ingots, but there doesn't appear to be any feasible way of avoiding constant incidental contact.