Abstract: By using flame atomic absorption spectrometry in the high concentration of zinc electroplating waste content. According to two different zinc characteristic lines, select the appropriate measurement conditions, we determined the high concentration of zinc content,China digital thermometer and accuracy, recovery experimentsChina clinical thermometer were carried out. The measurement is simple, to reduce intermediate links, saving time and increasing accuracy of measurement.
Keywords: electroplating; atomic absorption; concentration; zinc
CLC number:China ear thermometer X83 Document code: A Article ID :1674-098X (2011) 02 (c) -0083-02
Taixing City in Jiangsu Province, a total of 21 electroplating plants, and another three hot-dip galvanizing plant. The 24 companies in the use of China digital blood pressure monitor zinc as a raw material 10, the discharge of liquid waste with higher levels of zinc; and for higher concentration of zinc samples, the usual analysis of the high concentration of the sample measured after several dilution . However, individual companies wastewater emissions of zinc content is more than 1000ug/mL,China digital thermometer manufacturer diluted several times to be continuous, so that the measured concentrations have a greater error. In this paper, flame atomic absorption spectrometry, the determination of conditions to select a different parameter, can be directly measured zinc content. The method is rapid, accurate, simple, and can be used China clinical thermometer manufacturer for electroplating solution composition analysis.
China medical thermometer manufacturer 1 Apparatus and reagents
1.1 Instrument
TAS-986 atomic absorption spectrometer (Beijing Purkinje General Instrument Co., Ltd.)
China rapid thermometer WM-2B-type oil-free air compressor (Tianjin Medical Equipment Factory)
Zinc standard solution 1.2
China ear thermometer manufacturer Weigh 1.0000g of zinc metal (99.99%) in 50mL beaker, add the appropriate amount of 1 +1 nitric acid dissolved into 500mL volumetric flask, dilute to the mark with deionized water. This concentration is 2.000mg/mL.
Zinc standard solution 1.3
Draw 1.2 stock solution were prepared into a concentration of 100ug/mL and 10ug/mL zinc standard solution.
1.4 Zinc standard solution series
(1) Pipette 10ug/mL zinc standard solution 0,0.5 mL, 1mL, 3mL, 5mL, 10mL in 100mL flask, diluted with deionized water to the mark, this series of concentration of 0,0.05 ug / mL , 0.1ug/mL, 0.3ug/mL, 0.5ug/mL, 1ug/mL. (Curve 1 Standard Series)
(2) Pipette 100ug/mL zinc standard solution 0,2 mL, 4mL, 6mL, 8mL, 10mL in 100mL flask, diluted with deionized water to the mark, this series of concentration of 0,2 ug / mL, 4ug / mL, 6ug/mL, 8ug/mL, 10ug/mL. (Curve 2 standard series)
(3) Pipette 1.2 stock solution 0,1.5 mL, 2.5mL, 5.0mL, 10.0mL, 25.0mL, 50.0mL, 100.0mL in 100mL flask, diluted with deionized water to the mark, this series of concentration 0 , 30ug/mL, 50ug/mL, 100ug/mL, 200ug/mL, 500ug/mL, 1000ug/mL, 2000ug/mL. (Curve 3 standard series)
2 Experimental part
2.1 curve 1 Standard Series Measurement conditions as in Table 1.
2.2 Curve 2 Standard Series Measurement conditions as in Table 2.
2.3 Determination of the standard series of curve 3 in Table 3.
2.4 Experimental Methods
Take 50mL 100mL water sample into a beaker, adding nitric acid 3mL, in the electric panel heating digestion. To about 5mL, 1mL adding 3mL of nitric acid and perchloric acid, to continue digestion until nearly dry, remove the cooled, dissolved in water, into 50mL volumetric flask, dilute to the mark with deionized water. With atomic absorption spectrometry, while nitric acid 0.2 50mL, according to the same operating procedures, as a blank.