400 ppb – (0.5 ng / 0.5 g)

400 ppb – (0.5 ng / 0.5 g)

 

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▶ 참고: SI 접두어. SI prefixes

[ https://ywpop.tistory.com/2328 ]

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1 ppb = 1 ng/g 이므로,

(0.5 ng / 0.5 g) = 1 ng/g = 1 ppb

 

 

 

또는

[(0.5 ng) (1 g / 10^9 ng) / 0.5 g] × 10^9 = 1 ppb

( 참고 https://ywpop.tistory.com/2657 )

 

 

 

400 ppb – 1 ppb = 399 ppb

 

 

 

답: 399 ppb