Answer / umesh

In ISO 9001:2000 ,their are 8 clauses.

Answer / sowjanya

ISO Class Average number of air changes per hour
ISO 5 240–360 air changes per hour (unidirectional airflow)
ISO 6 90–180 air changes per hour
ISO 7 30–60 air changes per hour
ISO 8 10–25 air changes per hour
Conventional building 2–4 air changes per hour

hii, i'm had a sample of 1L that gone through extraction & evaporation. i used 0.5ml of methanol for reconstitution before injecting the sample to HPLC. i made a calibration curve using a standard solution but now i'm confused about how to display the concentration i got from the sample. for ex. i got 0.2ug/ml how i'm gonna explane this is for the 1L ? please help .. i'll really appreciate it thanks

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