Extraction solvents which cyanidin from purple cabbage lam RA can be used to detect ion Cu (II), Pb (II), (III), Al, and Fe (III) based on polylactic acid conditions and change the color by a bass-see with the naked eye as well as the quality and quantity analysis analysis. Is the lowest concentration that can detect Cu (II), Pb (II), (III), Al, and Fe (III) 80 μ μ m to 50 m 50? Μ μ m and 200 m respectively.
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