DC Arc Analysis by Dr. N. W. H. Addink (auth.)

By Dr. N. W. H. Addink (auth.)

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0·136Tbp(KJ/A = 22,400//A x S, Therefore: or S, = 165//(Tbp(KJ X 10- 3 ) (16) (17) By putting graphically values of S 1 after Eq. (14) against those of Eq. (17) we obtain a fairly good agreement between both values (see Fig. 9). Comment. In case of element concentrations of less than 100%, say b%, the righthand parts of Eq. (15) as well as of Eq. (16) have to be multiplied by b/100, but the result (Eq. (17)) remains the same. Therefore s, is independent of the concentration of the element present in the sample, provided that a fixed amount of it, in our case 5 mg, is examined.

4), this group is less sensitive to additions than the alkalis. However, at the same time, the degree of ionization dependent upon the value of V1 plays a role in the same sense. The position of Li added as Li 2 C0 3 (boiling point in between both groups) explains its use as a stabilizing element generally applied. Spark lines of the alkaline earths, originating from the core, appear to be very sensitive to a complete absence of other elements. 2), which means that in the atomion equilibrium, [M] is large and [M+] is small.

2) reads as follows: logs, = 3·06 - 0·44 Tbp x to-a (14) It can be accepted that, in case of large samples, the rise of the temperature of the anode takes place in steps, each one corresponding with the boiling point of the evaporating element or compound. However, if the anode has been loaded with small samples such as 5 mg when the heat of evaporation Q5 is also small then the temperature rises smoothly (see Fig. 8). The speed of evaporation, of the element or compound in question, depends on the position of the boiling point on the temperature curve (Fig.

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