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缓冲剂 (Disodium tetraborate), tracable to SRM from NIST and PTB pH 9.18 (25°C) CertiPUR®
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缓冲剂 (Boric acid, Sodium hydroxide, Potassium chloride) tracable to SRM from NIST and PTB pH 11.00 (25°C) CertiPUR®
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缓冲剂 (Citric acid, Sodium hydroxide, Hydrogen chloride), tracable to SRM from NIST and PTB pH 2.00 (25°C) CertiPUR®
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缓冲剂 (di-sodium tetraborate), traceable to SRM from NIST and PTB pH 9.22 (20°C) CertiPUR®
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from NIST/PTB pH(S) = 9.18₄ (25°C) CertiPUR®
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缓冲剂 (Disodium hydrogen phosphate/Sodium hydroxide) traceable to SRM from NIST und PTB pH 12.00 (25°C) CertiPUR®
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缓冲剂 (Disodium hydrogen phosphate/Sodium hydroxide) traceable to SRM from NIST und PTB pH 12.00 (25°C) CertiPUR®
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缓冲液 (potassium hydrogen phthalate), traceable to SRM from NIST and PTB pH 4.01 (25°C) CertiPUR®
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缓冲液 (potassium hydrogen phthalate), traceable to SRM from NIST and PTB pH 4.01 (25°C) CertiPUR®
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缓冲液 (boric acid/potassium chloride/sodium hydroxide solution), traceable to SRM from NIST and PTB pH 9.00 (25°C) CertiPUR®
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