Soils weight loss

Atmospheric exposure, fresh and salt waters, and many types of soil can cause uniform corrosion of copper aHoys. The relative ranking of aHoys for resistance to general corrosion depends strongly on environment and is relatively independent of temper. Atmospheric corrosion, the least damaging of the various forms of corrosion, is generaHy predictable from weight loss data obtained from exposure to various environments (31) (see Corrosion and CORROSION CONTKOL). 

I Ualloy ferrous materials Neutral waters, saline and soil solutions (25°C) <-0.53 <-0.85 Protection against weight loss corrosion Fig. 2-9 [29-34] (with film formation is more positive)... 

Cu, CuNi alloys Neutral waters and soils <-1-0.14 <-0.18 Protection against weight loss... 

In tests carried out by the National Bureau of Standards in the USA specimens of copper alloys, lead, zinc and zinc alloys were buried at a number of different sites for periods varying from 11 to 14 years. The soils tested covered a pH range from 2-6 to 9-4 and resistivities ranged from 62 to 17 800 fi cm. The weight losses and maximum depths of pitting were recorded, and the results indicated that the most severe corrosion occurred in soils of poor aeration having high acid and soluble-salt contents. 

Burmell, P. L., Tait, D. E. N., Flanagan, P. W. and Van Cleve, K. (1977). Microbial respiration and substrate weight loss, I. A general model of the influences of abiotic variables. Soil Biol. Biochem. 9, 33-40. 

However, dietary fat consumed has got to go somewhere. If it is not absorbed, then it must traverse the gut and be excreted in the feces. Here the net effect is to increase the level of fat and oil in the feces and the result is not difhcult to guess. About half of the people on orlistat have a problem with fecal incontinence and underwear soiling. There is a price to pay for orlistat-assisted weight loss. 

PVA films buried in soil were tested after 120 days and showed only very limited signs of biodegradation, and even field tests with PVA sheets buried for 2 years in different natural soil sites showed only limited (10%) weight loss. No traces of colonising microorganisms were detected on the incubated material. Degradable polymers like poly(hydroxy butyrate), PCL or starch are usually extensively... 

ASTMD1413 fungal enriched soil burial weight loss, decay... 

Table III Effect of furfuryl alcohol resin treatment of wood on the weight loss due to decay under ASTM soil-block tests for 12 weeks. 1/...

It is of interest that veneer-faced low-density particleboards made from acetylated veneers and acetylated core particles showed excellent dimensional stability in both liquid water and humidity tests and were resistant to attack by fungi in an 8-week soil block test [57]. Furthermore, during the 150-day bending-creep test, the totally acetylated boards showed no strength or weight loss during exposure to T. palustris. 

Figure 1 Effect of acetylation on the decay resistance of wood against Tyromyces palustris (A). Serpula lacrymans (B), Coriolus versicolor (C), and soil burial (D). (O) Japanese cedar (Cryptomeria japonica), ( ) Japanese red pine Pinus densiflora) (A) albizzia (Albizia falcata), (A) Japanese beech (Fagus crenata). Relative weight loss = Wj/Wi X 100, W, weight loss of control wood W2. weight loss of acetylated wood.

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