Spark medium voltage

Spark sources are especially important for metal analysis. To date, medium-voltage sparks (0.5-1 kV) often at high frequencies (1 kHz and more), are used under an argon atmosphere. Spark analyses can be performed in less than 30 s. For accurate analyses, extensive sets of calibration samples must be used, and mathematical procedures may be helpful so as to perform corrections for matrix interferences. In arc and spark emission spectrometry, the spectral lines used are situated in the UV (180-380nm), VIS (380-550nm) and VUV (<180 nm) regions. Atomic emission spectrometry with spark excitation is a standard method for production and product control in the metal industry. 

Tab. 6. Analytical precision of spark ablation ICP-OES for a BAS 410/1 steel sample, ccu = 3.6 mg/g. Line pair leu 324.7 nm/lfe 238.2 nm- 400 Hz medium voltage spark, 1.5 kW argon ICP, transport gas flow 1.2 L/min, 0.5 m Paschen-Runge spectrometer, measurement time 10 s [213],...

Fig. 107. Determination of Si in Al alloys with medium voltage spark OES (A) and OES using a Grimm-type glow discharge (B). [480],...

High voltage sparks are of 10 < 1/c < 20 kV and are frequently used. Their time cycle is regulated metdianically or electrically. Medium voltage sparks (0.5 < Uq <... 

Figure 28. Burning spots obtained with a glow discharge (A) and a medium-voltage spark (B)...

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