He standard hi tuna Chinese standard-a copper leh copper alloy smelting leh processing products chemical composition atana siam a ni a, chu chu GB/T468-1997 "Copper Wire Ingots for Electrical Use", GB/T3952-1998 "Copper Wire Billets for Electrical Use" tih te hi a ni. GB/T467-1997 "Thianghlimna sang tak-." Cathode Copper" leh "Standard Cathode Copper", leh GB/T5231-2001 "Processed Copper leh Copper Alloys" "Chemical Composition leh Product Shape" atanga chhut, ram pum standard hmasa GB/5121-1996 "Chemical Analysis Methods for Copper and Copper Alloys" leh GB/T13293-1991 "Chemical High-Purity Cathode Copper siam dan thlirletna hmanrua". systematic takin an siam \\ha leh a ni. Toxic leh harmful analytical methods thlak nan advanced analytical techniques hman a ni a, hydride generation - non-dispersive atomic fluorescence spectrometry hmangin arsenic, antimony, selenium, tellurium, etc. te hriat theihna atan catalytic oscillopolarography thlak a ni a, analytical method thar pasarih siam niin redrafted a ni a, inductively coupled plasma atomic emission pawh a tel spectrometry hmanga zirchianna hman dan leh mercury thlirletna hmanrua, etc.
