Measurement of weight loss

5 g of dried sample is treated with 200 ml of 1% NaOH for Ih at 80 C, after which the sample is well rinsed and mn out in hot water. It is then treated in 200 ml of 0.5% HCl at 80 C for Ih, after which the sample is once again rinsed, boiled for h in distilled water, dried and weighed. Weight loss on scouring is normally 6- 

---

Tests for quality of sealing of anodic coatings have become internationally standardised. They include dye spot tests with prior acid treatment of the surface (ISO 2143 1981 and BS 6161 Part 5 1982), measurement of admittance or impedance (ISO 2931 1983 and BS 6161 Part 6 1984), or measurement of weight loss after acid immersion (ISO 3210 1983 and BS 6161 Part 3 1984, and ISO 2932 1981 and BS 6161 Part 4 1981). Of these the chromic-phosphoric acid immersion test (ISO 3210) has become the generally accepted reference test. 

Nomnetallics As stated, corrosion of metals apphes specifically to chemical or electrochemical attack. The deterioration of plastics and other nonmetallic materials, which are susceptible to sweUing crazing, cracking, softening, and so on, is essentially physiochemical rather than electrochemical in nature. Nonmetallic materials can either be rapidly deteriorated when exposed to a particular enviromnent or, at the other extreme, be practicidly unaffected. Under some conditions, a nonmetallic may show evidence of gradual deterioration. However, it is seldom possible to evaluate its chemical resistance by measurements of weight loss alone, as is most generally done for metals. 

Atomic oxygen oxidation of polymers has been reported by a few authors (46,50). Experiments were limited to the measurements of weight-loss data and changing of the wetteability (46-48), and only two papers were devoted to the study mechanism of atomic oxygen oxidation of polydienes (49,50). 

Measurement of Weight Loss of Insulin-Loaded Matrix In Response to Glucose... 

The conventional approach to asphalt analysis has been to extract the bitumen with an organic solvent and then to characterize bitumen and minerals separately. Sulfur content and melting point are commonly measured properties of bitumen. Minerals are generally screened and then subjected to simple quantitative tests. Measurement of weight loss on ignition helps to distinguish between calcium carbonate, which loses... 

Thermal Analyses. Thermal techniques such as differential thermal analysis, thermal gravimetric analysis, and derivative thermogravimetric analysis have been successfully applied to characterizing various minerals in coal (58). The methods are based on measurements of weight loss or heat transfer during phase changes at temperatures from ambient to over 1000° C. 

The Zr/AbOa and La/AbOa systems were used for the preparation of washcoated supports. Special washcoating procedure has been developed. The properties of washcoated supports are given in Table 2. The attrition test procedure includes the measurement of weight loss of the sample by abrasive powder in the air flow. Testing conditions were the following ... 

The most common method for the determination of the corrosion rate of homogeneous corrosion is the measurement of weight loss. The mass change is measured after exposure of the metal to the corrosive media for a defined time and conditions. The material consumption rate II is calculated by the weight loss Am per time t and area A... 

Battles et al (391). The vapor pressures covering PUC2 in equilibrium with graphite was also determined by Mulford et al. (393) through measurement of weight loss from Knudsen cell at 2000 2400°K, while Harris et al. (394) used transpiration for measurements covering PuC + C at 2017 2472°K and PuC + PU2C3 at 1761 1907°K. No information, however, is available on the vaporization of nonstoichiometric Pu-C systems. 

The measurement of weight loss with temperature using calcium oxalate monohydrate is performed as follows ... 

RG. 4—Comparison of Intergranular corrosion in various acid solutions. Measurement of weight-loss and change in electrical resistance on sensitized stainless steel corroding in boiling 65 % nitric acid, and boiling sulfuric acid solutions containing cupric or ferric sulfate. Specimen 0.15 by 0.60 cm In cross section. 

On the other hand, if the substrate is large and insoluble in water, such as a fiber or a film of biodegradable material, physical measurements are commonly used to assess the initial microbial attack on the substrate. These methods include microscopic examination, measure of weight loss, or measure of the loss of mechanical strength. As the biodegradation of the fiber continues, individual small molecules are released and chemical analyses of monomers and products of mineralization can be detected. Often, several of these methods are used in a single study to confirm and characterize the biodegradation of the test material. 

Measurement of weight loss from resin system degradation as a function of temperature. Td is typically defined as the point at which 5 percent of the original mass is lost to decomposition, but other levels can also be reported, e.g. 1 percent, 2 percent, or onset. ... 

ASTM D1239 [252] covers the measurement of weight loss of film (thickness < 0.025 mm) after immersion in chemicals [256]. 

---