Subject Matter and Scope This standard specifies the used potassium sulphate (or nitrate - perchloric acid) as oxidant, the unfiltered water sample digestion, the instrument using the national standard ammonium molybdate spectrophotometric method for total phosphorus. 
 Total phosphorus, including soluble, particulate, organic and inorganic phosphorus. 
 This standard applies to surface water, sewage and industrial wastewater. 
 25mL specimen obtained, the standard minimum detectable concentration was 0.01mg / L, measured a maximum of 0.6mg / L. 
 Under acidic conditions, arsenic, chromium, sulfur interfere with the determination. 

 Principle products used under the conditions of potassium in the neutral (or nitric acid - perchloric acid) to sample digestion, to which all oxidized to orthophosphate phosphorus. In acid medium, reaction of orthophosphate with ammonium molybdate, antimony salt in the presence of heteropoly acids of phosphorus generated immediately after the reduction by ascorbic acid to produce a blue complex. 

 Technical Features (01) accurate determination of total phosphorus in waste water; 
 (02) memory standard curve of multiple revisions and self-preservation; 
 (03) without manual production curve, the instrument can be automatically stored according to the standard curve to calculate the sample; 
 (04) can store multiple sets of data more precise information (measuring time, parameter, value); 
 (05) Print the current data and all stored historical data; 
 (06) transfer to the PC, all the current data and historical data storage; 
 (07) digestion automatically adjust the number of power with the load, so the real temperature control; 
 (08) Automatic thermostat reminded, automatic countdown buzzer alarm can be set regular time;