Samples oven dried

Organic carbon can be determined in calcareous soils after the carbonates have been removed by treatment with sulphuric acid-iron(II) sulphate solution and the samples oven-dried at 105°C. However, as in all other wet-combustion methods, chloride ions interfere [7]. Interference from small amounts of chloride ions (up to 4mg of Ch as KC1 or NaCl) was reduced by adding 2.5% of mercury II oxide or silver I sulphate to the acid digestion mixture. 

Where A is weight of grafted sample after extraction, B is weight of original sample (oven-dry), and C is weight of homopolymer. 

For solid samples, oven-dried (105°C for 2 hr) potassium chloride can be used to dilute samples across the entire range of 40,000 to 385 cm ... 

Moisture. In relatively pure sugar solutions, moisture is deterrnined as the difference between 100 and Brix. In crystalline products, it is usually deterrnined by loss-on-drying under specified conditions in an oven or by commercial moisture analyzers that have built-in balances. Moisture in molasses and heavy symps is deterrnined by a special loss-on-drying technique, which involves coating the sample onto sand to provide a greater surface area for oven drying. The result of this test is usually considered dry substance rather than moisture. 

S5mthetic resin-embedded alfalfa samples were oven dried at 65 °C for 24 h and cut at 40-90 nm. The slides were analyzed using a JEOL 2010-F TEM prepared with field emission gun, EDS, and a high angle annular dark field detector for the analysis of solitary nanoparticles. 

The water content of a sample is a basic datum for calculating the value per gram of dry matter. Water content is expressed as the ratio of the mass of water present in the sample to the mass of the sample after it has been oven dried at 105 °C to a constant mass. Alternatively, the ratio of the mass of water present in the sample to the mass of the sample before oven drying is used. It is important to specify which is being used. 

A 50-g (based on the oven-dry weight) soil sample is weighed into a centrifuge tube and blended at 7000 rpm with 100 mL of methanol for 10 min. The resulting... 

Eizember, R. F. et al., J. Org. Chem., 1974, 39, 1792-1793 During oven-drying, kg quantities of the salt exploded violently. Investigation showed that self-propagating and extremely rapid decomposition of a cold sample can be initiated by local heating to over 200° C by a flint spark, prolonged static spark or flame. The sodium salt could only be initiated by flame, and the free acid is much less sensitive. 

Cells are maintained in suitable medium and starved of serum, if required. Agonist/inhibitors are added for 30 min first, then [35S]Met (5 iCi/ml medium) is added for 60 to 120 min. Cells are then lysed and cleared lysates (equal amounts of proteins) are loaded onto 3 MM papers. After the samples have been allowed to soak into the paper, the papers are boiled in 5% (w/v) TCA three times (2 min each time), rinsed with 100% ethanol, and oven dried. [35S]methionine incorporation is measured in 3 ml of scintillation fluid. 

The amount of water present is fundamental to the stability of confectionery products. Unsurprisingly, therefore, measuring water content is an important exercise. Various methods are used. Some oven drying moisture content determinations are still carried out. This sort of work is difficult since the moisture contents are normally low and the samples can only be dried with difficulty. In particular, there are problems in drying the product in a reasonable time without charring it. Various other methods of water content determination are in use. One such is the Karl Fischer titration. 

Samples are oven dried at 100°C after which they are weighed in order to measure water content. TC and TS are measured by introducing dried samples to the Carbon Sulfur (CS) automatic analyzer (Eltra CS-800) instrument. Subsequently, 2g of each sample is introduced in preweighed high temperature porcelain crucibles and is introduced to a high temperature muffle furnace for the removal of carbonates at 900C. Samples are then introduced to the CS automatic analyzer for measurement of organic residual carbon. 

Another sample, after oven drying, was irradiated by microwave radiation from 2 to 20 min. A comparison of the catalyst properties and water-gas shift rates is provided in Table 124. The authors observed important increases in the activity after treatment with sodium borohydride and hydrazine, which they correlated with an improvement in the reducibility (i.e., intensity of low temperature peak in TPR) related to reduction of Au oxide species and partial reduction of Fe oxide. A decrease in the rate for the microwave irradiated catalyst was linked to Au crystallite growth, but the authors indicated that the procedure is still worth exploring, as the technique increased the number of Au species that were reducible at low temperature. 

Normally, mass measurements are not made on hot objects. Waiting for an oven-dried soil sample to cool in air will have what effect on its mass ... 

In this method approximately 19 samples of marine sediment were oven dried at 110°C then digested with nitric acid-perchloric acid and hydrofluoric acid-hydrochloric acid. The digested solution is made up to 50ml of an equal volume mixture of 6M hydrochloric acid and 2M nitric acid. 0.1ml or less of the digest was pipetted into the hydride generator, followed by 1ml 2M acetic acid, diluted to 100ml with double distilled water and reacted with sodium borohydride. 

In any study of the moisture sorption-desorption properties of modified wood, the moisture content of the samples is determined using gravimetric methods. Invariably, the EMC of the sample is based upon the oven-dry weight of the modified wood ... 

If the modification imparts dimensional stability to the wood, the difference between the water-saturated and oven-dry volume of the wood sample is reduced, resulting in a lower value for S. The increase in dimensional stability can then be evaluated in terms of an anti-swelling efficiency (ASE) ... 

The use of a water-soaking, oven-drying series of cycles for the determination of dimensional stability of wood is a severe test (although it may produce useful data) and it does not necessarily reflect the conditions that wood will encounter in service conditions. As a result, some workers determine dimensional stability by subjecting samples to different relative humidities. It can be readily understood that dimensional stability values determined using different methods will not be comparable and it therefore needs to be explicitly stated how these values were obtained. 

For work where it is critical to examine the properties of the chemically modified wood with the certainty that there are no by-products or solvents present, it is advisable not to rely solely on an oven-drying stage, or on vacuum-heating. More effective extraction can be achieved with the use of Soxhlet apparatus followed by oven-drying. However, the efficiency of this process is very dependent upon sample size and the scale at which the work is being performed. To ensure total removal of residual chemicals, it is usually a good idea... 

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