Sn T 2034 2007 Translated English Of Chinese Standard Snt 2034 2007 Sn T2034 2007 Snt2034 2007

This Standard specifies the identification of Dysmicoccus grassii (Leonardi) and Dysmicoccus neobrevipes Beardsley for imported plants.

This Part of SN/T 0481 specifies inductively coupled plasma atomic emission spectrometry (hereinafter referred as ICP-AES), the method to determine ferric oxide (Fe2O3), titanium dioxide (TiO2), silicon dioxide (SiO2), calcium oxide (CaO), magnesium oxide (MgO) content in bauxite. This Part is applicable to the determination of Fe2O3, TiO2, SiO2, CaO, MgO content in bauxite.

This Part specifies the method for determination of cobalt content in high nickel matte. This Part is applicable to the determination of cobalt content in high-nickel matte. Measuring range: 0.1% ~ 2%. 2 Method summary Decompose the sample with hydrochloric acid, nitric acid-potassium chlorate saturated solution. Use air-acetylene flame in hydrochloric acid (2 + 98) medium, to measure the absorbance at the wavelength of 240.7 nm of atomic absorption spectrometer, after subtracting the background. Calculate the cobalt content according to the standard curve method. 3 Reagents 3.1 Hydrochloric acid (¦Ñ1.19 g/mL). 3.2 Nitric acid (¦Ñ1.42 g/mL). 3.3 Nitric acid (1 + 1). 3.4 Ammonia (1 + 3). 3.5 Nitric acid-potassium chlorate saturated solution: Dissolve potassium chlorate in nitric acid (3.2) until saturated. 3.6 Cobalt standard storage solution: Weigh 1.0000 g of metallic cobalt (mass fraction of cobalt ¡Ý 99.95%). Slowly add 20 mL of nitric acid (3.3) into a 400 mL beaker. Cover with a watch glass. Heat at low temperature to completely dissolve. Remove it. Use water to rinse the watch glass and cup wall. Heat and boil to remove nitrogen oxides. Remove it. Cool to room temperature. Transfer it into a 1000 mL volumetric flask. Use water to wash the watch glass and cup wall. Combine the washing liquid into the volumetric flask. Use water to make the volume reach to the mark. 1 mL of this solution YS/T 252.3-2007 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 8 contains 1 mg of cobalt. 3.7 Cobalt standard solution: Pipette 20.00 mL of cobalt stand

This standard specifies the classification and code, the information required for ordering, size, shape, weight and tolerance, technical requirements, test methods, inspection rules, packaging, marking, quality certificate of hot-rolled steel checker plate and strip. This standard applies to diamond-shaped, lentil-shaped, round-bean-shaped and combined-shaped hot-rolled steel checker plate and strip.

This Standard specifies the size, shape, technical requirements, test methods, acceptance rules, packing marks, certificate of quality and other contents of heatresistant steel rods.

This Standard specifies the jar candle.

This Standard specifies classification, basic performances, requirements, test methods, inspection rules, marking, packaging, storage and transportation of elastic rubber parts for railways. This Standard applies to elastic rubber parts for shock absorption, buffer, flexible connection, limiting, etc. in hanging system, equipment installation system, connection, limiting positions, etc. of railways.

This Standard specifies technical requirements, test methods, inspection rules, packaging, storage, marks and quality certificate of ferroniobium. This Standard is applicable to ferroniobium that is made from niobium pentoxide and niobium concentrate and is used for steelmaking or casting as an additive, for electrode as alloying agent, magnetic material.