捷克Istran www.istran.sk
捷克istran成立于1995年，砷及重金屬在線分析儀
ISTRAN was founded in 1995 to develop and produce chemical analysers for laboratories and outdoor applications as well as for on-line monitoring of waters and technological liquids.
The analysers of ISTRAN have found numerous applications in environmental analysis, food chemistry, process analysis (microelectronics, chemistry, metallurgy, water resources, etc.).
Some typical applications involve the determination of metals, semi-metals such as As, Ag, Bi, Cd, Cu, Cr, Fe, Hg, Mn, Pb, Sb, Se, Sn, Tl, Zn, etc., in an extremely wide concentration range beginning at the low ppb (ug/l)levels. Moreover, the systems enable the measurement of some non-metals such as chlorides, bromides, iodides, sulphides, sulphites, ammonia, phosphates, acids, bases, EDTA, etc.
Most applications make use of flow-through electrochemical coulometry and in-electrode coulometric titrations - methods developed or improved by ISTRAN in cooperation with Slovak, Czech and German universities.
Some unique applications: 
Direct determination of total arsenic in various types of samples, such as waters, technological liquids, foods. 
Calibrationless (absolute) analysis of trace concentrations of heavy metals (Hg, As, Se, Zn, Cd, Pb, Cu, Mn). 
Unattended and simultaneous monitoring of trace concentrations of some species in complex matrices. 
Measurement of trace concentrations of arsenic in concentrated cadmium solutions. 
On-line simultaneous monitoring of tin and lead in waste waters. 
Fast determination of iodides in salts, food additives, beverages, foods and urine. 
Measurement of oxide layers on tin coated steel sheets. 
Simple and fast determination of ascorbic acid (C vitamin) in beverages, vegetables, fruits, milk powder, etc., by means of a portable coulometric analyser PCA.