Centrifugation time. Calculate the centrifugation time, tc, necessary to remove particles from solution greater than approximately 0.5 μm (5×10¥5 μm) equivalent diameter (which represents all particles except the fine clay fraction) using the fol- lowing equation: Equation 3 tc(min)=1.41×109 [log(R2/R1)]/N2 where: tc=centrifuge time in minutes R2=distance from centrifuge spindle to depo- sition surface of centrifuge R1=distance from spindle to surface of the sample N=number of revolutions of the centrifuge per minute.
Centrifugation time. Ca lc u l a t e t h e ce n t r ifu g a t io n t i m e, tc, n ecess a ry t o r e m ove p a r t icles f r o m sol u t io n g r e a t e r t h a n a pp r oxi m a t el y 0.5 μm (5×10¥5 μm ) eq u iv a le n t di a m e t e r ( w h ic h r ep r ese n t s a ll p a r t icles excep t t h e fi n e cl a y f r a c t io n) u s i n g t h e followi n g eq u a- t io n: Equation 3 t c( m i n)=1.41×109 [ log( R 2/R1)]/N2 w h e r e: t c=ce n t r ifu ge t i m e i n m i nu t es R2=dis t a n ce f r o m ce n t r ifu ge spi n dle t o depo- s i t io n s urfa ce of ce n t r ifu ge R1=dis t a n ce f r o m spi n dle t o s urfa ce of t h e s a m ple N= nu m be r of r evol u t io n s of t h e ce n t r ifu ge pe r m i nu t e.
