Measurement of Hexavalent Chromium in ChromateConversion Coating and Metal Ions in Eluate

Introduction

In the electrical and electronics sector, not only does a standard apply for industrial wastewater resulting from the manufacture of electrical and electronic equipment (JIS K 0102 Testing methods for industrial wastewater), manufacturers must also abide by restrictions on the use of specific toxic substances (RoHS Directive). These standards and restrictions brought about a change in the treatment agent used for chromate conversion coating used to improve corrosion resistance from hexavalent chromium to trivalent chromium, a change in the solder used to join metals to a lead-free type. The presence of these constituents and the amounts of these constituents present in waste liquids must also be managed. The water analysis program for the UV-1280 UV-VIS spectrophotometer can be used with a PACKTEST series of products made by Kyoritsu Chemical-Check Lab., Corp. to easily test for 39 water quality items and 22 water quality species, including hexavalent chromium and lead. This Application News describes the measurements of the amount of hexavalent chromium used in plating on screws, and the amounts of metal ions that elute from commercially available lead and copper products, using the water analysis program for the UV-1280.

September 20, 2016 GMT