<?xml version="1.0" encoding="UTF-8"?><toc><section id="sec_foreword"><title>Foreword</title></section><section id="sec_1"><label>1</label><title>Scope</title></section><section id="sec_2"><label>2</label><title>Principle</title></section><section id="sec_3"><label>3</label><title>Interferences</title></section><section id="sec_4"><label>4</label><title>Reagents and materials</title></section><section id="sec_5"><label>5</label><title>Apparatus</title></section><section id="sec_6"><label>6</label><title>Sampling</title><section id="sec_6.1"><label>6.1</label><title>Sampling procedure</title></section><section id="sec_6.2"><label>6.2</label><title>Sample preparation</title></section></section><section id="sec_7"><label>7</label><title>Procedure</title><section id="sec_7.1"><label>7.1</label><title>Calibration</title><section id="sec_7.1.1"><label>7.1.1</label><title>Blank test</title></section><section id="sec_7.1.2"><label>7.1.2</label><title>Calibration of the analyser</title></section><section id="sec_7.1.3"><label>7.1.3</label><title>Check of the calibration using metal standard</title></section></section><section id="sec_7.2"><label>7.2</label><title>Determination</title></section></section><section id="sec_8"><label>8</label><title>Calculation</title></section><section id="sec_9"><label>9</label><title>Precision</title></section><section id="sec_10"><label>10</label><title>Test report</title></section><section id="sec_bibl"><title>Bibliography</title></section></toc>