Dear Bala,

Generally, you have to report the soil result on the dry weight basis.

level of constituent in soil (L)=M1/M2

where,

M1= weight of constituent (TOC or TNM or Sulphate )

M2= Dry weight of soil

Therefore,

L in ppm=M1(in mg)/(M2 in kg)

=M1(in mg)/(5/1000)kg

If you need In g/kg

L in g/kg = (M1 in g)/(M2 in kg)

If you need to converte X ppm to X g/kg

1ppm = 1/100000

X ppm= X mg/1000000 mg

=(x/1000)g/(1000000/1000000)kg

=(x/1000)g/1kg

=(x/1000) g/kg

that mean If you divide your ppm value by 1000, result is in g/kg

Piyal Aravinna

Hi Bala,

1ppm=1mg/kg ========> 1mg/kg= 0.001g/kg

A. G. Piyal Aravinna Mehdi Moameri Lawrence Mayhew