Method for measuring boric acid and borate in cosmetics by microwave digestion -ICP-OES
An -ICP-OES, microwave digestion technology, applied in the detection field of boric acid and borate content in cosmetics, can solve the problems of poor reproducibility, complicated operation and processing steps, low sensitivity, etc., to achieve improved recovery and strong specificity , the effect of high sensitivity
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[0036] 1. The use of equipment and equipment conditions
[0037] 1.1 Instrument used: Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-OES), model: VARIAN720ES.
[0038] 1.2 Instrument working conditions, see Table 2.
[0039] 2. Use reagents:
[0040] 2.1 The reagents used are of superior grade, and the experimental water is the first-grade water specified in GB / T6682.
[0041] 2.2 Nitric acid (ρ1.42g / mL); hydrogen peroxide (30% aqueous solution).
[0042] 2.3 Boron standard stock solution: use national standard reagent (GBW), the concentration is 1000μg / mL.
[0043] 2.4 Yttrium standard stock solution: use national standard reagent (GBW), the concentration is 100μg / mL.
[0044] 2.5 Boron standard working solution: Accurately draw 1.0mL boron standard stock solution (GBW) into a 100mL volumetric flask, dilute with 5% nitric acid solution to volume, this standard stock solution is equivalent to 10μg boron per milliliter.
[0045] 3. Sample Digestion
[0046] We...
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