6.3.2.4 Reagents (standard solutions)
Prepare a series of individual stock standard solutions of the individual phthalate esters in n-Hexane as shown in Table 3.
Table 3 — Stock solutions
Phthalate ester DIDP DINP DBP BBP DNOP DEHP
Concentration μg/ml 5 000 5 000 200 200 200 200
Where appropriate from the stock standard solutions prepare two sets of five phthalate esters
GC-MS calibration solutions in n-Hexane to the maximum linear concentration shown in Table 4 (Calibration Set 1), and Table 5 (Calibration Set 2).
Table 4 — Calibration Set 1
Phthalate ester DINP DBP BBP DEHP
Concentration μg/ml 5 000 20 20 20
Table 5 — Calibration Set 2
Phthalate ester DIDP DNOP
Concentration μg/ml 5 000 20
6.3.2.4 试剂(标准溶液)
用正己烷为溶剂分别制备各类邻苯二甲酸酯类的标准储备液,如表3所示。
表3 — 标准储备液
邻苯二甲酸酯类 DIDP DINP DBP BBP DNOP DEHP
浓度 μg/ml 5 000 5 000 200 200 200 200
分别用各邻苯二甲酸酯类的标准储备液制备2套
GC-MS测试用标定溶液,每套5个浓度成线性关系,其最大线性浓度见表4(标定浓度1)及表5(标定浓度2)。
表4 — 标定浓度1
邻苯二甲酸酯类 DINP DBP BBP DEHP
浓度 μg/ml 5 000 20 20 20
表5 — 标定浓度2
邻苯二甲酸酯类 DIDP DNOP
浓度 μg/ml 5 000 20
Where appropriate from the stock 啥意思?语法上看不懂