Barium

Basic toxicokinetics

Administrative data

Endpoint:

basic toxicokinetics in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2010-09-01

Rationale for reliability incl. deficiencies:

other: The activity of the Laboratory Department is certified according to the ISO 9001:2008 standard.

Materials and methods

Objective of study:

bioaccessibility (or bioavailability)

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

One liter of demineralised water has been adjusted to pH = 1.5 by adding HCl 37%; 300 ml of the previous solution has been spilled in one glass beaker and the temperature has been regulated at 37°C. Agitating sufficient quantity of the Ba-substance has been dissolved to reach a saturated solution keeping the temperature at 37 °C. After 15 minutes additional reaction time the solution has been filtered with preheated filtering equipment. The barium content in the filtrate has been determined by gravimetric analysis (the filtrate had for BaCl2*2H2O test a pH = 0.6).The objective of this study is to assess the dissolution of chemical compounds in different artificial physiological media. The test media are selected to simulate relevant human-chemical interactions (as far as practical), i.e. contact of a test substance with skin, a substance entering the human body by inhalation or by ingestion into the gastro-intestinal tract. The amount dissolved of the test item is specified by the mass concentration of the substance in the test media under the applied test conditions. The total dissolved amount will be determined by measuring the total vanadium concentration in solution. Additionally, V(IV) and V(V) will be separated by HPLC and detected by ICP-MS. The concentration of possible further species (i.e. V(III)) will be determined indirectly by subtracting the concentrations of V(IV) and V(V) from the total dissolved concentrations.

GLP compliance:

no

Test material

Test material information

Specific details on test material used for the study:

Form: crystalline

Radiolabelling:

no

Test animals

Species:

other: in vitro (simulated human body fluids)

Applicant's summary and conclusion

Conclusions:

510.4 g/L barium dichloride dihydrate dissolves in a artificial gastic fluid of HCl solution (pH 1.5) at 37°C. After dissolution the pH value of the solution was: 0.8.