Analysis of the Concentration of Heavy Metals in Khat Grown in Meru County and the Assessment of Their Associated Health Risks

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">ICP-AES parameter</td><td class="align_center">Value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Pressure of argon gas</td><td class="align_center">450 ± 10 kPa</td></tr><tr><td class="align_left">Nebulizer flow</td><td class="align_center">0.90 L/min</td></tr><tr><td class="align_left">Plasma power</td><td class="align_center">1300 W</td></tr><tr><td class="align_left">Radio frequency generator</td><td class="align_center">1.2 kW</td></tr><tr><td class="align_left">Pump rate</td><td class="align_center">25 rpm</td></tr><tr><td class="align_left">Coolant flow rate</td><td class="align_center">12.00 L/min</td></tr><tr><td class="align_left">Vacuum pressure</td><td class="align_center">&gt;10 Pa</td></tr><tr><td class="align_left">Exposure time</td><td class="align_center">30.0 seconds</td></tr><tr><td class="align_left">Carrier gas flow rate</td><td class="align_center">0.70 L/min</td></tr><tr><td class="align_left">Auxiliary gas flow</td><td class="align_center">0.60 L/min</td></tr><tr><td class="align_left">Plasma gas flow rate</td><td class="align_center">10.0 L/min</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Instrumental parameters and operating conditions for ICP-AES.</div>

International Journal of Analytical Chemistry

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Table 1

Table 1: Analysis of the Concentration of Heavy Metals in Khat Grown in Meru County and the Assessment of Their Associated Health Risks 