scholarly journals Comparative Study of Leaching of Aluminium from Aluminium, Clay, Stainless Steel, and Steel Cooking Pots

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
A. T. Odularu ◽  
P. A. Ajibade ◽  
P. C. Onianwa

Analyses on the absorption of aluminium by rice boiled in distilled water in a variety of containers, such as old and new aluminium pots, clay receptacles, stainless steel pots, and steel pots, were carried out. 10 g of rice was taken as a representative sample. Colorimetric analysis of classical methods was used to determine the concentration of aluminium. The control for aluminium was 350 ± 130 μg/g. The new aluminium pots had a concentration of 126 ± 64 μg/g, old aluminium pots had 314 ± 128 μg/g, new clay pots had 132 ± 68 μg/g, old clay pots had 195 ± 137 μg/g, new steel pots had 241.00 ± 200 μg/g, old steel utensils had 186.83 ± 75.18 μg/g, new stainless steel utensils had 294.83 ± 163 μg/g, and old stainless steel utensils had 289.00 ± 75.155 μg/g. Aluminium leaching was detected in all forms of new and old cooking utensils, and leaching was below and within the control concentration range. Old aluminium pots had the highest concentration of leaching while new steel pots had the least leaching of aluminium. However, the aluminium contamination of the foods tested was insufficient to constitute a hazard to health.

Coatings ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 51 ◽  
Author(s):  
Ronny Gouveia ◽  
F. Silva ◽  
Pedro Reis ◽  
A. Baptista

2014 ◽  
Vol 83 ◽  
pp. 2-11 ◽  
Author(s):  
E. Real ◽  
I. Arrayago ◽  
E. Mirambell ◽  
R. Westeel

Author(s):  
Yusen Qi ◽  
James F. Klausner

It has been well established that the rate of heat transfer associated with boiling systems is strongly dependent on the nucleation site density. Over many years attempts have been made to predict nucleation site density in boiling systems using a variety of techniques. With the exception of specially prepared surfaces, these attempts have met with little success. This paper presents an experimental investigation of nucleation site density measured on roughly polished brass and stainless steel surfaces for gas nucleation and pool boiling over a large parameter space. The fluids used for this study, distilled water and ethanol, are moderately wetting and highly wetting, respectively. Using distilled water it has been observed that the trends of nucleation site density versus the inverse of the critical radius are similar for pool boiling and gas nucleation. The nucleation site density is higher for gas nucleation than for pool boiling. An unexpected result has been observed with ethanol as the heat transfer fluid, which casts doubt on the general validity of heterogeneous nucleation theory. Due to flooding, few sites are active on the brass surface and at most two are active on the stainless steel surface during gas nucleation experiments. However, nucleation sites readily form in large concentration on both the brass and stainless steel surfaces during pool boiling. The nucleation site densities for the rough and mirror polished brass surfaces are also compared. It shows that there is no large difference for the measured nucleation site density.


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