Similarly, after 12 months of storage, increase in the kinematic viscosity was found to be 1.12 × 10-5and 1.48 × 10-5 m2/s for samples kept in exposure to air at 25°C and 35°C, respectively (Figure 3c).
Sufficient proof of stability was gathered for samples kept at 4 °C in the dark for at least 4 weeks.
The maximum increase in density value was found to be from 0.85 to 1.3 kg/m3 in case of 4°C storage temperature, from 0.85 to 1.8 kg/m3 for 25°C, and for 35°C, it increased up to 2.3 kg/m3 for the sample kept but exposed to air.
The distillation temperature required for thermal decomposition of biodiesel was also found to be higher for the sample exposed to air than that for the sample kept in sealed condition (Table 1).
But, it remains at 138°C for the sample kept in dark and sealed conditions.
For the sample kept in the climatic chamber and oven, there is a change in nature of spectra observed at wavelength of about 500 550 nm; these could be due to heating of the samples, that is, 40°C in climatic chamber and 50°C in oven.
On the other hand, for the same sample kept in sealed condition, the increase in kinematic viscosity was found up to 8.2 × 10-6 and 9.1 × 10-6 m25°Cand25°C and 35°C, respectively (Figure 3b).
Philippe Martin the minister for ecology, durable development and energy, added that all ivory seized in France in future would be destroyed, apart from samples kept for scientific or educational purposes and those items that might help trace traffickers.
The effect could be clearly seen in Figure 19, where the effort is linear multiplication of single sample, for higher numbers of samples kept in parallel.
The changes in microstructure and depletion of alloying components of the sample kept for 2000 h have been studied using scanning electron microscope (SEM), energy disperses X-rays (EDS) and electron probe beam microanalysis (EPMA).
