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<p>This document specifies two methods for the determination of the neutralizing value (NV) of liming materials.</p>
<p>Method A is applicable to all liming materials except silicate liming materials.</p>
<p>NOTE 1 Examples of hard liming materials are limestone and dolomite. Examples of soft liming materials are chalk, marl and burnt lime. </p>
<p>Method B is applicable to all liming materials.</p>
<p>Neither method correctly takes into account the potential neutralizing value of material containing more than 3 % P<sub>2</sub>O<sub>5</sub>. For a more accurate agronomic assessment of products containing more than 3 % P<sub>2</sub>O<sub>5</sub>, EN 14984<sup>[8] </sup>is used to determine the liming efficiency.</p>
<p>NOTE 2 The methods described in ISO 6598 and ISO 7497 can be used for the determination of P<sub>2</sub>O<sub>5</sub> content. Further information on P analyses is given in References [5] and [6].</p>
<p>NOTE 3 Carbonate consumes H<sup>+</sup> and removes acidity in solution with subsequent dissociation to H<sub>2</sub>O and CO<sub>2</sub>. Forms of orthophosphate can consume H<sup>+</sup> but are not dissociated to molecular forms that remove acidity. The acidity is back titrated with alkali causing an underestimation of NV.</p>
Reģistrācijas numurs (WIID)
69678
Darbības sfēra
<p>This document specifies two methods for the determination of the neutralizing value (NV) of liming materials.</p>
<p>Method A is applicable to all liming materials except silicate liming materials.</p>
<p>NOTE 1 Examples of hard liming materials are limestone and dolomite. Examples of soft liming materials are chalk, marl and burnt lime. </p>
<p>Method B is applicable to all liming materials.</p>
<p>Neither method correctly takes into account the potential neutralizing value of material containing more than 3 % P<sub>2</sub>O<sub>5</sub>. For a more accurate agronomic assessment of products containing more than 3 % P<sub>2</sub>O<sub>5</sub>, EN 14984<sup>[8] </sup>is used to determine the liming efficiency.</p>
<p>NOTE 2 The methods described in ISO 6598 and ISO 7497 can be used for the determination of P<sub>2</sub>O<sub>5</sub> content. Further information on P analyses is given in References [5] and [6].</p>
<p>NOTE 3 Carbonate consumes H<sup>+</sup> and removes acidity in solution with subsequent dissociation to H<sub>2</sub>O and CO<sub>2</sub>. Forms of orthophosphate can consume H<sup>+</sup> but are not dissociated to molecular forms that remove acidity. The acidity is back titrated with alkali causing an underestimation of NV.</p>
