AOAC 984.27-1986 用感应耦合等离子体发射光谱法测定婴儿食品中钙、铜、铁、镁、锰、磷、钾、钠和锌

标准号：AOAC 984.27-1986
中文标准名称：用感应耦合等离子体发射光谱法测定婴儿食品中钙、铜、铁、镁、锰、磷、钾、钠和锌
英文标准名称：Calcium, Copper, Iron, Magnesium, Manganese, Phosphorus, Potassium, Sodium, and Zinc in Infant Formula Inductively Coupled Plasma Emission Spectroscopic Method
标准类型：X04
发布日期：1986/1/1 12:00:00
实施日期：1986/1/1 12:00:00
中国标准分类号：X04
引用标准：JAOAC 67
适用范围：This standard is specifies Calcium, Copper, Iron, Magnesium, Manganese, Phosphorus, Potassium, Sodium, and Zinc in Infant Formula Inductively Coupled Plasma Emission Spectroscopic Method A. Principle Test portion is digested in HNO3/HCiO4 and elements are determined by ICP emission spectroscopy.B. Reagents (a) Water.--Distilled, deionized. Use throughout. (b) Perchloric acid.--Double-distilled. Dilute l 0 mL to 50 mL with H20. (c) Standards.--All preparations yield 1000/-tg/mL. (1) Calcium.--Place 2.4973 g CaCO3 in I L volumetric flask with 300 mL H20, add 10 mL HCI, and after CO2 has been released, dilute to I L. (2) Copper.--Dissolve 1.000 g Cu in 10 mL HCI plus 5 mL H20 to which HNO3 is added dropwise until dissolution is complete. Boil to expel fumes, cool, and dilute to 1 L with H20. (3) Iron.--Dissolve 1.000 g Fe wire in 20 mL 5M HCI; dilute to 1L with H20. (4) Potassium.--Dissolve 1.9067 g KCI in H,O and dilute to 1 L with H20. (5) Magnesium.--Dissolve 1.000 g Mg in 50 mL 1M HCI and dilute to 1L with H20. (6) Manganese.--Dissolve 1.000 g Mn in 10 mL HCI plus 1 mL HNO3 and dilute to 1 L with H20. (7) Sodium.--Dissolve 2.5421 g NaCI in H20 and dilute to 1L with H20' (8) Phosphorus.--Dissolve 4.263 g (NH4)2HPO4 in H,O and dilute to 1 L with H20. (9) Zinc.--Dissolve 1.000 g Zn in 10 mL HCI and dilute to 1 Lwith H20. Commercially available certified standards may be substituted for any of the above element solutions. (d) Calibration standards.--Prepare to concentration indicated in Table 984.27, using standards above. All calibration standardsshould be prepared to contain 20% HCIO