Thank you for the fast reply.
I have deviated from the rule and left the volume data as cm3/g as the numbers become too small.
On Table 4, the inclusion of std dev in the table is OK. Actually I prefer to report SD. Is it 1 x SD or 3 x SD that you are reporting? For the Ca data the SD values are 0. What are the actual SD values or were they not calculated?
I made a mistake while typing my last email.