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상품명 | TM149-TM 149 Chelation Value of Aminopolycarboxylic Acids |
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판매가 | 견적문의 |
월 렌탈 금액 |
월 원 (개월 기준)
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구매방법 | |
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배송주기 |
정기배송 할인 save
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옵션선택 |
(최소주문수량 1개 이상 / 최대주문수량 0개 이하)
사이즈 가이드할인가가 적용된 최종 결제예정금액은 주문 시 확인할 수 있습니다.
TEST METHODS ARE DELIVERED AS A LINK IN YOUR EMAILED RECEIPT.
AATCC TM149-2018e, Chelation Value of Aminopolycarboxylic Acids and Their Salts: Calcium Oxalate
Developed in 1976 by AATCC Committee RR90; editorially revised and reaffirmed 1977, 1985 (with title change), 1977; reaffirmed 1980, 2002, 2007, 2012; editorially revised 1984, 1986, 1988 (with title change), 2010, 2019; revised 1992, 2018 (with title change).
Foreword
The titration in this method yields a value that includes partially-substituted EDTA, HEDTA, DTPA, nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), glycolate and other weak chelating agents found in some commercial products. An alternative procedure, excluding the effect of partially-substituted products, is provided in AATCC TM168, Test Method for Chelation Value of Polyaminopolycarboxylic Acids and Their Salts: Copper PAN.
1. Purpose and Scope
1.1 The active content of ethylenediaminetetraacetic acid (EDTA), N-hydroxyethylenediaminetriacetic acid (HEDTA) and diethylenetriaminepentaacetic acid (DTPA) and their salts is usually expressed by the calcium chelation value (CaCV). This value indicates the amount of calcium (as calcium carbonate) which will be chelated by a known weight of chelating agent.
2. Principle
2.1 The chelation value is determined experimentally by titrating a weighed sample of chelating agent with a calcium ion solution of known concentration. A precipitating anion (oxalate) is present during the titration. As the calcium solution is added, the ions are chelated by the chelating agent and no permanent precipitate is formed as long as there is free chelating agent present. Beyond this point, any excess calcium ion that is added reacts with oxalate anion to form a cloudy precipitate which is the endpoint. Ê
2.2 The (CaCV) indicates the amount of calcium (as calcium carbonate) which will be sequestered by a known weight of chelating and is expressed as milligrams of calcium carbonate (CaCO3) per gram of chelating agent (mg calcium carbonate/g chelating agent).
Copyright American Association of Textile Chemists and Colorists, RTP, NC, USA. All rights reserved.
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