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Ajhil at 15:56, 12 February 2016

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__NOTOC__
{{OR/14/067}}
==Initial preparation==
* Dowex 1X8–200 anion exchange resin (Sigma Aldrich) Approx. 50 g per sample
* Dax-8 resin (Supelco, Supelite) Approx. 50 g per sample
* Methanol (Analar) For preparing and cleaning Dax-8 resin — volume needed can be estimated according to requirements
* Hydrochloric acid (Aristar) For preparing and cleaning Dowex anion exchange resin — volume needed can be estimated according to requirements
* Potassium Chloride (Analar) 44.73 g required to make up 1litre — Two litres needed ideally just to elute for PO4
* Potassium phosphate (KH2PO4) used to make up a PO4 standard

==Magic precipitation==
* Magnesium Chloride (MgCl2.6H20) (Analysis grade) 2 g per sample
* Sodium Hydroxide (Analysis grade) 0.4 g per sample

==Cerium precipitation==
* Acetic acid, glacial (Analar) At least 2 ml per sample
* Nitric acid (Arsitar) At least 1 ml per sample
* Potassium acetate (Analar) Approx. 0.49 g needed to make up 0.5 M solution for 10 samples
* Potassium hydroxide (may be necessary for adjusting pH)
* Cerium (III) nitrate hexahydrate (From Merck described as ‘Extra pure’) 400 mg per sample

==Cation resin==
* Dowex 50W X-8 cation exchange resin (Sigma Aldrich) Approx. 4 g per sample
* Nitric acid (Aristar) For preparing and cleaning Dowex cation exchange resin — volume needed can be estimated according to requirements

==Silver phosphate precipitation==
* Silver nitrate (AgNO3) (Analar) Approx. 2.54 g required to make up solution per 10 samples
* Ammonium nitrate (NH4NO3) (Analar) Approx. 4.3 g required to make up solution per 10 samples
* Ammonium hydroxide (NH4OH) (Analytical grade — From Fluka described as ‘for trace analysis’) Approx. 7–8 ml required per 10 samples

==Removal of residual organics from silver phosphate==
* Hydrogen peroxide (H2O2) (Analar) 0.25 ml required per sample
[[category:OR/14/067 Method for analysing phosphate 18O/16O ratios for waters with high C:P ratios| 03]]

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Dbk: Protected "OR/14/067 Reagent required for silver phosphate precipitation" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

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Ajhil at 15:56, 12 February 2016