"SDN:S04::S04254" . "accepted"@en . "manual analysis using the phenol and sodium nitrocyanoferrate method"@en . "SDN:S04::S04254" . . . . "" . "1" . "2006-10-02 18:26:59.0" . . "SDN:S04::S04254" . . "1" . "false" . . "2006-10-02 18:26:59.0" . . "A colorimetric technique for the determination of ammonium concentration."@en .