Abstract: A computer-based method and system for tracking a price change of a purchase made using a transaction card over an interchange network is provided. The interchange network includes a price tracking computer device in communication with a memory device. The method includes receiving, at the interchange network, transaction data associated with a purchase of an item by a cardholder using the transaction card, transmitting via the interchange network an authorization message in response to the purchase of the item, directing at least some of the transaction data to the price tracking computer device including a purchase price of the item, and using the price tracking computer device to track changes in a current asking price of the item, and compare the purchase price of the item to the current asking price of the item.

Abstract: A computer-based method and system for tracking a price change of a purchase made using a transaction card over an interchange network is provided. The interchange network includes a price tracking computer device in communication with a memory device. The method includes receiving, at the interchange network, transaction data associated with a purchase of an item by a cardholder using the transaction card, transmitting via the interchange network an authorization message in response to the purchase of the item, directing at least some of the transaction data to the price tracking computer device including a purchase price of the item, and using the price tracking computer device to track changes in a current asking price of the item, and compare the purchase price of the item to the current asking price of the item.

Abstract: An organic carbon analyzer system particularly adapted for the continuous analysis of raw sewage of a municipality. A gaseous transport is provided for carrying acidified liquid sewage including dispersed particulate matter through an elongated aeration chamber wherein carbon dioxide evolved from inorganic salts diffuses away from the sewage and into the gas. A second gaseous transport free of carbon dioxide and including an oxidizing agent then carries the sewage into a heated chamber having a tortuous interior surface which provides sufficient retention time to oxidize organic carbonaceous materials of the sewage resulting in a second evolution of carbon dioxide. An analyzer provides a continuous reading of the concentration of the carbon dioxide produced in the heated chamber.

Abstract: An organic carbon analyzer system particularly adapted for the continuous analysis of raw sewage of a municipality. A gaseous transport is provided for carrying acidified liquid sewage including dispersed particulate matter through an elongated aeration chamber wherein carbon dioxide evolved from inorganic salts diffuses away from the sewage and into the gas. A second gaseous transport free of carbon dioxide and including an oxidizing agent then carries the sewage into a heated chamber having a tortuous interior surface which provides sufficient retention time to oxidize organic carbonaceous materials of the sewage resulting in a second evolution of carbon dioxide. An analyzer provides a continuous reading of the concentration of the carbon dioxide produced in the heated chamber.