Post-sampling storage

Butzbach DM. The influence of putrefaction and sample storage on post-mortem toxicology results. Forensic Sci Med Pathol 2010 6 35-45. 

Whole-body dosimeters are processed post-exposure as follows. The whole-body dosimeter is laid on a table covered with fresh aluminum foil and is sectioned into various pieces using a solvent-cleaned pair of scissors. The whole-body dosimeter is usually cut just at the knees to provide two lower leg sections, at the waist to provide an upper leg section, at the elbow to provide two lower arm sections, at the edge of each shoulder to provide two upper arm sections, and across the shoulders and down each side of the chest area to provide a front torso and back torso sample. The two-dosimeter sections from symmetrical parts of the body are combined to form one sample and wrapped in aluminum foil prior to storage. The upper leg, front torso, and back torso pieces are kept separate, and each is wrapped in aluminum foil prior to storage. 

Rossmann R. 1988. Estimation of trace metal storage in Lake St. Clair post-settlement sediments using composite samples. J Great Lakes Res 14 66-75. 

In another part of this study we wished to see the effects of post-modification treatments on the properties of the modified LDPE surface. Polyethylene samples were photosulfonated for different periods of time. Afterwards they were subjected to an after-treatment by conditioning in an electrolyte solution (aqueous KC1, 10-3 M) for 48 hours and then characterized by zeta potential measurements. This conditioning process resulted in a shift of f to even less negative values (see Fig. 8). This finding may be explained by the swelling of the polymer samples (water adsorption) in water that causes a shift of the shear plane of the electrochemical double layer into the liquid phase. This effect demonstrates that storage conditions and pre-conditioning may exert a pronounced influence on the zeta potential recorded for surface-modified polymers. Phenomena of this kind have already been described in previous literature [26,27],... 

Post-modification treatments like storage conditions (air/water) and preconditioning may exert a pronounced influence on the zeta potential obtained for surface modified polymers. Sulfonated LDPE samples, which were subjected to an after-treatment by conditioning in an electrolyte solution, showed a shift of the zeta potential to even less negative values. This may be explained by the swelling of the polymer samples, which occur during storage in aqueous media. 

Total sterol levels are affected by cultivar and region of cultivation. The ripening causes a slow continuous decrease of these compounds. Tocopherols are influenced by genetic and environmental factors, conditions of post-harvest fruit transportation and storage, and oil conservation. The smallest quantities were found in oil samples with high acidity and peroxide values. 

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