5Wsp Absorpcji metali

THE UPTAKE OF HEAVY ELEMENTS BY HUMAŃ BEINGS

TABLE 14.1 Absorption Factor (%) for the Heavy Elemnts from the Gastrointestinal Tract into Blood

Element	Absorption factor %	Suggested value	Comments/conditions
Cd	3-8, 4.7-7	6	Influenced by Ca^2+and Zn^2*
Hg Inorg.	7,15,8-20	10	protein content and solubility of Cd compounds. Vaues for Hg^2". The Hg* is
Hg Org.	>80, 95, -100	100	poorly absorbed because of Iow solubility. Almost completely absorbed
In Tl	<5 >70,33, -100	80	because soluble in fats. Rapid and complete absorption
Pb adult	7,10	10	for soluble species. Influenced by diet and fasting.
Pb infant	25-53,50	40	Influenced by diet and fasting.
As	-100,5-25		High absorption for anionie and
Sb	3-80,50,80		soluble species, Iow for insoluble species. Similar to arsenie.
Bi	<5,8	6	Soluble compounds morę
Se	>70, 33-80	80	readily absorbed. Value for anionie soluble
Te	25,47,88		species, insoluble compounds poorly absorbed. For water soluble species.

TABLE 14.9 Intake and bsorption of Lead from Air, Waler and Food by Adults and Children

Source*	Intake	Lead intake *igd-^ł	Absorpt. factor	Lead uptake Hg d’^1	% of total No Inelude smoking smoking
Adults				T
Air	22 m^3	11	0.4	4.4	21.1	16.4
Food	1.5 kg	150	0.1	15.0	71.8	55.8
Water	1.51	15	0.1	1.5	7.2	5.6
Smoking	30 cigs.	15	0.4	6.0		22.3
Total (including smoking)			191		26.9
Total (excluding smoking)			176		20.9
Children					No	Inelude
					dust	dust
Air	6.5 m^3	3.3	0.4	1.3	13	1.6
Food	1.0 kg	100	0.5	50	88.8	61.5
Water	1.01	10	0.5	5	8.9	6.2
Dust	50 mg	50	0.5	25		30.8
Total (including dust)			163.3		81.3
Total (excluding dust)			113.3		56.3

* Concentrations: air 0.5 *ig nr³, food 0.1 pg g-¹, water 10 pg l*^ł, smoking 0.5 |xg cig*¹, dust 1000 pg g*.