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Determination of
substrates’ salinity
1.
Take a representative substrate sample
2.
Thoroughly stir the substrate in order homogenise the sample
3.
Determination of salinity in homogenised sample (see icons 1-8)
(1)
Cylindrically
enwrap the enclosed 100
ml measuring cup with a
firm
DIN-A4-sheet
of
paper.
(2)
Fill sample loosely
above the top of the cup.
(3)
To
compress
sample toss the cup 10x
on a solid surface.
(4)
Remove
paper
and surmounting sample.
(5)
Fill measured 100
ml sample in 1-ltr-wide-
necked-bottle.
(6)
Add
500
ml
distilled
water,
close
bottle and shake several
times.
(7)
Filter the mixture
after 10 min. with fluted
filter.
(8)
Measure
conductivity in filtrate.
1.
Calculation of salinity:
Conductivity (in mS) x 0,528 x 5 = salinity in g/ltr. substrate
E.g.:
A EC-measurement of 0,37 mS (= 370 µS) results in a salinity of:
0,37 x 0,528 x 5 = 977 mg salt/l substrate
2.
Benchmarks:
Substrates for salt-sensitive cultures, piquet substrates
500
– 1000 mg/ltr.
Substrates for less sensitive cultures, pot substrates
1000
– 2000 mg/ltr.
Substrates for salt compliant cultures, e.g. chrysanthea
2000
– 3000 mg/ltr.
