Antiserum specific for rabbit β2-microglobulin was obtained from mouse. The antiserum was used for measuring concentration of this protein in rabbit urine by electrosyneresis. Its lower limit of the detection was 50 mg/l. Excretion of urinary β2-microglobulin in the rabbit administered sodium chromate increased temporarily and reached to the maximum (above 800 mg/l) 2 days after the administration.
Adsorption capacities of sampling tubes packed with various kinds of active carbons for collecting vinyl chloride vapor were measured. Among the active carbons with identical particle size, those made from coconut shell and wood were more effective than those from petroleum pitch giving longer breakthrough times. The tubes packed with active carbons of smaller particle sizes adsorbed vinyl chloride vapor for longer periods than those with larger particle sizes. The break-through time in adsorbing vinyl chloride flow using active carbon tubes containing 150 mg carbon of a definite type in a glass tube of 4 mm inside diameter varied depending on the sampling conditions, i.e., the active carbon tube adsorbed the vapor for a longer period when the sampling rate was slower and the humidity in the flow was low.
The quantitative analysis of standard asbestos (chrysotile) for airborne asbeatos dust in industrial environments was performed by X-ray diffraction technique combined with a X-ray absorption correction method. Through this investigation, it was revealed that airborne asbestos (chrysotile) of 5 to 50 μg per cm2 mounted on a silver membrane filter could be quantitatively measured with high accuracy when an airborne dust sample contained 1 to 10% of chrysotile (w/w) in any matrix by this correction method. When an airborne dust sample was composed of pure or nearly pure chrysotile, the quantitative analysis could be done up to 5 mg per cm2. On the basis of these results, it was concluded that the X-ray absorption correction method is quite useful for determination of airbon asbestos dust in industrial environment and without knowledge on the kind and the percentage of matrix existing in an airborne dust sample, the true weight of chrysotile could be obtained in the range of 5 to 50 μg per cm2. By considering that quantitative range, sampling condition, especially sampling air volume, was evaluated. As the diffraction intensity of chrysotile is fairly sensitive to physical and chemical condition of preparation, a proposal for making a standard sample was also cited.
A newly developed dynamic force pickup was applied to measurement of vibra-tion force, in which several experimental conditions were examined by laboratory tests using the vibration table for establishment of the method of force measure-ment. For real application, effectiveness of vibration isolation materials to portable vibrating tools was measured by the force pickup. As the field survey, the vibra-tion force level and the spectra were observed on a rivetting hammer. It was concluded that the force pickup with the cross section of about 45 x 30 mm2 was usable. The following conditions were suitable to get good reproducibility and linearity, namely, pressing force to the force pickup more than 3 kgf, angles of each joint of the hand-arm at 90°C and the near-wrist position on the palm touch-ing the force pickup. The vibration force-frequency characteristics obtained under these conditions were confirmed by digital simulation using a mini-computer. It was realized that use of the force pickup to check the effectiveness of the vibration isolation materials like rubber foam was problematic, because of large dependence on the measuring conditions. On the rivetting hammer, the vibration force spectra had the main components at 31.5 and 40 Hz, and its force level was about 150 dB±2 dB. The isolation material was not effective on the rivetting hammer, for the main frequency was very low.