Japanese comments on the NWI
“Extraction of trace elements in soils using ammonium nitrate solution”
We do not agree to add this
proposed NWI to the working program of the committee at this time,
because the scope of the proposed method is closely related to the evaluation
of (bio)available fraction of elements.
As is already announced, a new WG to work on bioavailability was
established under SC7 in the last TC190 meeting and it started to work on
making a framework from which boundary conditions for methods to be developed
can be derived. To keep the
coherence among mutually related international standards as much as possible,
the further discussion about the proposed matter should be adjourned at least
until the framework of the a new standard on bioavailability has been
solidified.
We do agree that the
proposed extraction method would be useful for evaluating labile fraction of
trace elements in soils and we will participate in the future work for
development of the proposed item.
Introduction, the fore part
In the 20th line from the top, “a” is to be put before “calcium chloride.”
Introduction, Prediction of impact
In the first line in a) General, “a” is to be placed in front of “ammonium
nitrate solution.” In the third line in b) Plant intake, “the” is
to be put before “element.” In the sixth line in c) Migration of
elements, “speed” is to be exchanged with “rate.”
Introduction, Sampling
In the first line, “element” is to be replaced with “elements.”
3 Principle
Two “the”s are to be put in front of “solution” in the first line as well as in
fron of “soil” in the second line.
4.1 1 mol/l ammonium nitrate
In the third line, “a” is to
be placed in front of “ready-to use.”
5.6 Overhead shaker
“20 cm” is not expressed with an
appropriate unit and is to be changed to “200 mm.”
A.1.2 Flame atomic absorption spectrometry
In the first line, “form” is to be replaced with “forms.”
A1.3 Graphite furnace atomic absorption spectrometry
In the bottom line, “a” is to be placed before “ammonium nitrate solution.”
A.1.6 Inductively coupled plasma mass spectrometry
In the second line, “in a ratio” is to be changed to “at a ratio,” and “a” is
to be put before “nebulizer” in the same line. In the third line, “the”
is to be added just in front of “1 mol/l ammonium nitrate solution.” In
the fourth line, “a” is placed in front of “count rate.”
A.2 Calculation
In the second line, “the” is to be put before “dry residue.”
A.5 Notes on homogenization, initial sample mass and extraction
In the fourth line in the part of Homogenization of freshly collected samples,
“the” is to be put before “solution.” Furthermore, two “the”s are to be
added in front of “ammonium nitrate solution” in the third line as well as in
front of “solution” in the fifth line in the part of Extraction of organic
horizons.