Colorimetric methods of determining hypophosphite contents of solutions

Claim 1

THE METHOD OF DETERMINING THE HYPOPHOSPHITE CONTENT OF A SAMPLE SOLUTION COMPRISING PRODUCING A TEST SOLUTION; WHEREIN 100 CC. OF SAID TEST SOLUTION ESSENTIALLY COMPRISES APPROXIMATELY SCC. OF A BORIC ACID STOCK SOLUTION, APPROXIMATELY 5 CC. OF A SODIUM SULFITE STOCK SOLUTION, APPROXIMATELY 5 CC. OF A MOLYBDIC ACID-SULFURIC ACID SOLUTION, AN ALIQUOT OF SAID SAMPLE SOLUTION APPROPRIATE TO BRING THE HYPOPHOSPHITE CONTENT OF SAID TEST SOLUTION DOWN INTO A PREDETERMINED RANGE OF APPROXIMATELY 1 TO 7 PARTS OF HYPOPHOSPHITE PER 1,000,000 PARTS OF SAID TEST SOLUTION BY WEIGHT, AND THE BALANCE WATER; WHEREIN SAID BORIC ACID STOCK SOLUTION CONTAINS ABOUT 5 GMS. OF BORIC ACID PER 100 CC. OF WATER, SAID SODIUM SULFITE STOCK SOLUTION CONTAINS ABOUT 5 GMS. OF SODIUM SULFITE PER 250 CC. OF WATER, SAID MOLYBDIC ACID-SULFURIC ACID SOLUTION CONTAINS IN APPROXIMATELY 100 CC. THEREOF ABOUT 50 CC. OF A MOLYBDIC ACID STOCK SOLUTION AND ABOUT 1 2/12 CC. OF CONCENTRATED SULFURIC ACID AND THE BALANCE WATER, AND SAID MOLYBDIC ACID STOCK SOLUTION CONTAINS IN APPROXIMATELY 200 CC. THEREOF ABOUT 20 GMS. OF MOLYBDIC ACID AND ABOUT 25 CC. OF 20% SODIUM HYDOXIDE AND THE BALANCE WATER HEATING SAID TEST SOLUTION AT A TEMPERATURE OF ABOUT 50* C. FOR A TIME INTERVAL OF ABOUT 30 MINUTES TO OBTAIN A MOLYBDENUM-BLUE REACTION THEREIN; AND MEASURING THE LIGHT TRANSMISSION CHARACTERISTIC OF THE BLUE COLORATION OF SAID TEST SOLUTION OF OBTAIN AN INDEX OF THE HYPOPHOSPHITE CONTENT THEREOF, WITHIN SAID PREDETERMINED RANGE.