公开(公告)号：US3895913A

公开(公告)日：1975-07-22

申请号：US50389574

申请日：1974-09-06

Applicant: BETZ LABORATORIES

Inventor： BOCKOWSKI EDMUND J ,  STEFANELLI LOUIS J

IPC: G01N33/18 ,  G01N31/22

CPC classification number: G01N33/1826 ,  Y10T436/174614

Abstract: Chelant residual or deficiency in water containing divalent calcium and magnesium hardness ions with or without heavy metal ions is determined photometrically by adding to the water a solution comprising the salt of a hardness ion and a second chelating agent, said agent having a higher affinity for heavy metals than the chelant to be measured, and then adding a solution of Calmagite dye, and then reading the change in absorbance of the dye solution with the photometer.

Abstract translation: 通过向水中添加含有硬度离子和第二螯合剂的盐的溶液，通过向水中加入含有或不含有重金属离子的二价钙和镁硬度离子的水中的残余物或缺乏物，所述试剂对重金属具有较高的亲和力 金属比待测量的螯合剂，然后加入Calmagite染料溶液，然后用光度计读取染料溶液的吸光度变化。

公开(公告)号：US3536637A

公开(公告)日：1970-10-27

申请号：US3536637D

申请日：1968-09-03

Applicant: BETZ LABORATORIES

Inventor： NOLL CHARLES A ,  STEFANELLI LOUIS J

IPC: B01J49/00 ,  B01D15/06 ,  C02B1/76

CPC classification number: B01J49/60

公开(公告)号：US3656908A

公开(公告)日：1972-04-18

申请号：US3656908D

申请日：1970-12-01

Applicant: BETZ LABORATORIES

Inventor： NOLL CHARLES A ,  FEDDERN EDWARD C ,  STEFANELLI LOUIS J

IPC: G01N31/22 ,  G01N21/20 ,  G01N21/24 ,  G01N33/18

CPC classification number: G01N31/22

Abstract: Method of determining the chromium concentration in an aqueous medium containing either or both trivalent chromium or hexavalent chromium. The method generally entails acidifying the aqueous medium, oxidizing any trivalent chromium present in the aqueous medium to hexavalent chromium, and adding to the medium a composition comprising a water-soluble cobaltous salt and a chelating agent of the acetic acid derivative type. The color intensity of the resulting medium is then measured and compared to the intensity of samples of aqueous medium containing known quantities of chromate in its hexavalent state which have been treated in the same manner. One of the other features of the invention is the composition used in the method.

Abstract translation: 测定含有三价铬或六价铬中的一种或两种铬的水性介质中的铬浓度的方法。 该方法通常需要酸化水性介质，将存在于水性介质中的任何三价铬氧化成六价铬，并向介质中加入包含乙酸衍生物类型的水溶性钴铵盐和螯合剂的组合物。 然后测量所得介质的颜色强度，并将其与已经以相同方式处理的六价态的已知量的铬酸盐的含水介质样品的强度进行比较。 本发明的其它特征之一是用于该方法的组合物。

公开(公告)号：US3622277A

公开(公告)日：1971-11-23

申请号：US3622277D

申请日：1969-12-29

Applicant: BETZ LABORATORIES

Inventor： NOLL CHARLES A ,  STEFANELLI LOUIS J

IPC: G01N31/02 ,  G01N31/22

CPC classification number: G01N31/02 ,  Y10T436/18

Abstract: Method for determining the sulfate ion concentration of an aqueous solution. The mechanism of the method resides in the use of a chelate of a metal which under acidic conditions dissociates to release metal ions which will react with the sulfate ion present to produce a colloidal metal sulfate precipitate. In order to ensure that the free chelant does not precipitate or react to form a precipitate, there is also added to the solution a quantity of a metal compound, the metal of which will replace the original metal of the chelate to form a water soluble second chelate. The turbidity or color density of the aqueous solution is measured and compared to the color density values obtained for solutions containing known quantities of sulfate precipitate of the same metal.

公开(公告)号：US3574551A

公开(公告)日：1971-04-13

申请号：US3574551D

申请日：1968-12-09

Applicant: BETZ LABORATORIES

Inventor： NOLL CHARLES A ,  STEFANELLI LOUIS J

IPC: G01N31/22 ,  G01N33/18

CPC classification number: G01N31/22 ,  Y10T436/16

Abstract: TEST METHOD FOR DETERMINING THE PHOSPHATE CONTENT OF LIQUIDS CONTAINING COMPLEX PHOSPHATES OR POLYPHOSPHATE COMPOUNDS, COMPRISING ADDING TO A SMALL SAMPLE OF THE LIQUID TO BE TESTED A FIRST AQUEOUS SOLUTION COMPRISING A WATER SOLUBLE FERRIC SALT, AN ALKALI METAL HALIDE, AN ALKALI METAL SALT OF A LOWER FATTY ACID AND A FIRST LOWER FATTY ACID. THE RESULTING SOLUTION IS THEN ALLOWED TO MIX AND A SECOND SOLUTION COMPRISING A HYDROXYBENZOIC ACID AND A SECOND LOWER FATTY ACID IS ADDED THERETO. THE COLOR INTENSITY OF THE RESULTING SOLUTION IS THEN MEASURED AND COMPARED TO A KNOWN STANDARD.