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‘Samples were heated to 450 deg C in a muffle furnace overnight.’ ‘Ash content was determined by combustion for 6 h at 500 deg C in a muffle furnace.’ ‘However, in this case organic C was removed from the sand by muffle furnace, following an initial wash to remove particulate material.’

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May 29, 2020 · Update: The interim guidance was updated on May 29, 2020. Updates include: Any duration of exposure should be considered prolonged if the exposure occurred during performance an aerosol-generating procedure.; The time period that should be used for contact tracing after exposure to asymptomatic individuals who test positive for SARS-CoV-2 was shortened.

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states that the requirements for Grade D breathing air according to Reference 2 are an oxygen content (v/v) of 19.5-23.5%, a hydrocarbon (condensed) content of 5 milligrams per cubic meter of air or less, a carbon monoxide (CO) content of 10 par ts

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A: Coronavirus disease 2019 (COVID-19) is a respiratory illness that can spread from person to person. There are many types of human coronaviruses, including some that commonly cause mild upper ...

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