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Natural copper salt test for heavy metals and arsenic of

Transferred into a muffle furnace, 580'E ignition 6h,[link widoczny dla zalogowanych], remove and let cool. Add 7mol / l hydrochloric acid 10ml, Gaiyan, water bath (80 ℃) constant heat lh, (every 20 minutes with a fine glass rod to stir a) allows the dissolved, centrifuged and supernatant was transferred to the measurement of arsenic bottle three times with water 23m1 washing apparatus and residues. After centrifugation, lotion bottle and arsenic were measured, dropping stannous chloride test solution, the yellow recede. Inspection method according to Arsenic (a 2005 edition of Chinese Pharmacopoeia Appendix Ⅸ F) check the color of the spots were arsenic arsenic spot compared with the standard, no more than ten millionths. Natural copper arsenic salt 3.2 Determination of (semi-quantitative) fixed amount of standard arsenic solution (1I ~ gAs / ml, 2m1), where appropriate, increase or decrease the amount of the test sample (based on the depth of arsenic spot), using the above method measurement, measured in three different sources of natural copper content range. When measured with the method set a reagent blank determination results in Table 1. From Table 1, different sources of native copper arsenic salt levels varied a lot, and some content is very high, only three natural copper sample 3 sample salt content of heavy metals and arsenic limits are in line with this standard. 3.3 Some notes on methodology (1) for the test product plus magnesium oxide and magnesium nitrate solution, soaking lh, water bath is to promote the purpose of the test does not generate volatile arsenic, arsenic trioxide is not sublimation of magnesium, magnesium arsenate. Avoid the process of evaporation and ignition loss of arsenic. After testing, the standard arsenic solution, by evaporation, ignition or other operation (No. 2), arsenic spot color than the direct determination of ignition is not the color of light a lot, add HNO0.2ml number 3 can not prevent the loss of arsenic, but adding MgO and 15% Mg (NO): a standard solution of arsenic solution (No. 4), can effectively prevent the arsenic in the process of evaporation and loss on ignition,[link widoczny dla zalogowanych], etc. (see Table 2). (2) the test is intended to enable ignition points to lift the natural copper sulfur, arsenic S spot checks to avoid interference. 4FeS2 +11 O2 = 2FeO3 +8 S02t (3) Pharmacopoeia Arsenic inspection, the test standards for arsenic in control solution and hydrochloric acid solution were added 5ml, this method increases 7mol / l hydrochloric acid 10ml, the equivalent of hydrochloric acid 6ml,[link widoczny dla zalogowanych], more 1rnl hydrochloric acid because Fe: O, and MgO are consumed hydrochloric acid. 29 * hydrochloric acid concentration of smoke in the relatively large heating,[link widoczny dla zalogowanych], evaporation losses and more, and accompanied the dye environment,[link widoczny dla zalogowanych], the change 7moVl hydrochloric acid, the effect is better. Table 2 on arsenic evaporation and ignition of spot color and to eliminate the effects of the test Note: The 1 hydrochloric acid lOml, water bath (8) on natural copper arsenic salt limit. Chinese Pharmacopoeia <8ooc) heated lh, the test can be completely dissolved. Drugs dissolved inorganic arsenic in the salt limit is usually available in small glass rod ppm every 2o minutes, stirring once. ~ Ten millionths. Minimum of 0.4 parts per million (Cl (5) Fe ¨ existence, consumption reducing agent (KI, sodium) parts per million maximum of twelve (sublimed sulfur). From SnCL:), and the oxidation of AsH ,, interfere with the determination, it is natural to be pre-copper arsenic salt, we determined the highest per million plus acidic stannous oxide test solution, the Fe reduced to Fe2 ,500-1000. Different sources of native copper arsenic salt phase to eliminate interference. Far worse, if the standards are too strict, it is difficult to meet the regulatory options 2Fe + Sn material liquid of the ten. when the standard arsenic solution should also be taken control of the reagents with the same amount of