Method Precision (CV) Comments Reference PBET 2-6% (n = 3) lead, stomach, probably within day variation /81;82/ PBET 36-70% (n = 3) lead, stomach and intestine, probably within day variation /81;82/ PBET²² 6,2 – 15 (n = 3) individual dioxins, stomach and intestine, probably within day variation /89/ Mass-balance 15% (n = 4) lead, stomach, probably within day variation /105/ Mass-balance 24% (n = 4) lead, stomach and intestine, probably within day variation /105/ Mass balance 8% (n = 4) arsenic, stomach, probably within day variation /105/ Mass-balance 21% (n = 4) arsenic, stomach and intestine, probably within day variation /105/ DIN <1 – 38% (n = 3-4) arsenic, stomach and intestine, probably within day variation /99/ DIN <1 – 33% (n = 3-4) lead, stomach and intestine, probably within day variation /99/ DIN²³ 2,3 – 31% (n = 3) individual dioxins, stomach and intestine, probably within day variation /92/ RIVM 7-10% (n = 4-5) PCB, stomach and intestine, probably within day variation /106/