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硫酸 96% for the determination of viscosity acc. to DIN EN ISO 307
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硫酸 96% for the determination of viscosity acc. to DIN EN ISO 307
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硝酸铵溶液 1 mol/l acc. to DIN 19730
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硫酸钡标准品 for white standard DIN 5033
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三磷酸五钠 for BOD determination acc. to DIN 38409-H-51
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三磷酸五钠 for BOD determination acc. to DIN 38409-H-51
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4-氯酚 for AOX determination acc. to DIN 38409-H 14
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1000 ppm总有机碳标准液 acc. to EN 1484-H3/DIN 38409-H3 as potassium hydrogen phthalate in water, stabilized 1000 mg/l CertiPUR®
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四草酸钾 certified secondary standard reference material for pH measurement
Potassium tetraoxalate dihydrate certified secondary standard reference material for pH measurement
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硼砂 ; 四硼酸二钠 certified secondary standard reference material for pH measurement
di-Sodium tetraborate decahydrate certified secondary standard reference material for pH measurement
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